What is a virtual machine and what does it do?

The concept of virtual machine is relatively broad, and people are usually exposed to the concept of virtual machine ranging from hardware simulation software such as VMware to software between hardware and compiler such as JVM. The latter is being referred to here.

A virtual machine is an abstract computer that, like a real computer, has an instruction set and uses a different storage area. It is responsible for executing instructions, as well as managing data, memory, and registers. This virtual machine provides a common interface to the compiler on any platform.

The compiler only needs to target the virtual machine, generate a code that the virtual machine can understand, and then the interpreter converts the virtual machine into machine code for a specific system.

A virtual machine is a complete computer system running in a completely isolated environment with full hardware system functions simulated by software. Each virtual machine has its own CMOS, hard disk, and operating system, and can be operated on the virtual machine as if it were a physical machine.

It must be occupied, it can be understood in this way, all of them are a CPU, a memory, a motherboard, these resources are shared, but you expand the capacity of the hard disk, if you are a server, if the web is shared, then it can be called web hosting.

Software for virtual computers, of course, takes up physical resources.

For example, if you have a piece of software to try out, you can use a virtual machine if you are afraid that it will mess up the system or something.

The role of virtual machines: Virtual machines allow users to build multiple independent virtual machine environments on one physical machine, so as to achieve the hybrid operation of multiple systems, for example, running Linux systems on a Windows server at the same time, so as to improve the flexibility and security of the system.

Expansion: In addition, virtual machines can help users save resources, reduce the cost of physical servers, and improve the utilization of hardware resources.

A virtual machine is a complete computer system simulated by software.

is a computer system that runs in a completely isolated environment. Generally speaking, it is a virtual computer, this virtual processing computer is almost exactly the same as the real computer, the difference is that the hard disk of the virtual machine is virtually processed in a file, so you can modify the settings of the virtual machine at will, without worrying about damage to the computer or system collapse.

Pros: 1If you only have one computer, but you want to run multiple systems at the same time. For example, if you have a Linux system installed on a hardware machine, but you need a Windows system to test, then the virtual machine comes in handy.

2.Multiple virtual machines can be installed, each with different workloads and different components, and can be used independently in parallel to complement each other.

3.It provides a degree of flexibility in terms of experimentation. Developers can use virtual machine software to create and test software on a variety of platforms.

4.Instead of running multiple computers all the time, many companies use virtual machines hosted on a small set of powerful servers, saving a lot of physical space, power, and maintenance.

When you create a virtual machine in a computer, you need to use part of the hard disk and memory capacity of the physical machine as the hard disk and memory capacity of the virtual machine. Each virtual machine has its own CMOS, hard disk, and operating system, allowing you to operate the virtual machine as if it were a physical machine. Therefore, it is better to test the performance of the CPU, hard disk and memory, otherwise the application may not perform well.

A virtual machine is a complete computer system that runs in a completely isolated environment with complete hardware system functions simulated by software.

The virtual system generates a new virtual image of the existing operating system, it has the same function as the real Windows system, after entering the virtual system, all operations are carried out in this new independent virtual system, you can install and run the software independently, save data, have your own independent desktop, will not have any impact on the real system, and has a class of operating system that can flexibly switch between the existing system and the virtual image.

A virtual machine is a system software, through its integrated software functions to simulate an independent system operating environment isolated from the host system based on the underlying hardware, and can install the operating system, software, etc., and the operation of the virtual system is no different from the real system.

To put it simply, it is a software, which simulates the real operating environment of the computer at the software level, and can install the system on it, and the operation is the same as the real system, but it is isolated from the real system, and the operation inside will not affect the real system.

Simple ones can be used to test systems (images), test software, file sharing, etc., complex ones can be used to set up a network experiment environment for network experiments, etc., and special versions of virtual machine software can be used to build virtual servers. There are many specific uses, depending on how you use them.

Install a virtual operating system.

One computer with multiple systems.

In fact, the virtual machine is to virtualize a computer to realize the function of a computer with multiple computers, but the performance of the whole machine will also be allocated by each virtual machine, so the more virtual machines are divided, the less CPU, memory, and storage space resources are allocated by each virtual machine, so the formation of virtual machines is usually the higher the configuration, the better, so it is widely used in server and other industries.

What is a virtual machine used for? The role of virtual machines in ordinary life and work is still quite large, for example, there is no optical drive in the simplest of our computers, if we want to install the system, we can use virtual machines to install the system, the virtual machine has a virtual optical drive inside, and it supports directly opening the system image file to install the system, in addition, the virtual machine technology is also quite practical in the eyes of game lovers and friends, for example, we know that many games on a computer do not support multiple openings at the same time, but we can create a few more virtual machines in the computer, Then you can run the program separately in the virtual machine system, so that you can open the same game on one computer at the same time. In addition, virtual machines have many functions, such as virus analysis and so on.

In fact, virtual machines are also widely used in enterprises, because the server is usually very high, because many server network providers in order to meet the needs of small and medium-sized webmasters, usually divide a server into a plurality of virtual machine servers, so that each can allocate a part of independent server resources, and do not affect each other and can be equipped with an independent IP address, which greatly solves the problem of high cost of small and medium-sized enterprises to use a single server, and the VPS servers currently purchased are all using this technology, I believe that the webmasters know more about the use of virtual machines.

With virtual machine software, you can simulate one or more virtual computers on a physical computer that work exactly like a real computer, such as installing an operating system, installing applications, accessing network resources, and so on. For you, it's just an application running on your physical computer, but for an application running in a virtual machine, it's like working in a real computer.

In fact, it is a simulated environment for software programmers to test software or systems, and of course it can also be used to install some toxic software, or remote software.

In the existing operating system, the operating system can be installed on a virtual set of hardware devices.

iouh virtual machine is very complicated, and it will not be clear here for a while, you can go to the sugar moon seller forum to find a virtual machine-related learning a third party.

1.Demo environment, you can install a variety of demo environments, easy to do a variety of examples; 2.Keep the host running fast and reduce unnecessary junk installers, occasionally used programs, or test programs running on virtual machines; 3.

Avoid running in a separate environment every time you reinstall common tools such as banks, which are not used often, and require better confidentiality; 4.If you want to test an unfamiliar application, install it in a virtual machine and delete it completely; 5.Experience different versions of the operating system, such as Linux, Mac, etc.

Endpoint virtualization is sought after due to the significant reduction in maintenance costs it brings – such as a smaller footprint, lower costs for hardware and software purchases, energy savings, and lower maintenance costs. It is more cost-effective than the actual terminal equipment. But these aren't the only reasons why the education industry and vendors are so fond of virtualization.

On the other hand, we don't talk much about it, and that's how virtualization can greatly improve the security of a system.

These are the answers given by the encyclopedia.

Generally speaking, a virtual machine is a computer virtualization to realize the function of a computer with multiple computers, but the performance of the whole machine will also be allocated by each virtual machine, so the more virtual machines are divided, the less CPU, memory, and storage space resources are allocated by each virtual machine, so the formation of virtual machines is usually the higher the configuration, the better, so it is widely used in servers and other industries.

The role of virtual machines in reality is still quite large, for example, there is no optical drive in our computer in the simplest, if you want to install the system, we can use a virtual machine to install the system, the virtual machine has a virtual optical drive inside, and it supports directly opening the system image file to install the system, in addition, the virtual machine technology is also quite practical in the eyes of game enthusiasts and friends, for example, we know that many games on a computer do not support multiple openings at the same time, but we can create a few more virtual machines in the computer, Then you can run the program separately in the virtual machine system, so that you can open the same game on one computer at the same time. In addition, there are many more roles of virtual machines, which will not be introduced here.

In fact, virtual machines are widely used in enterprises, because the server is usually very high, because many server network providers in order to meet the needs of small and medium-sized webmasters, usually divide a server into a plurality of virtual machine servers, so that each can allocate a part of independent server resources, and do not affect each other and can be equipped with independent IP addresses, which greatly solves the problem of high cost of small and medium-sized enterprises to use a single server. The virtual space used by friends in the early days is also the principle, and interested friends may wish to learn about it.

What can be done on a real computer can be done on a virtual machine, mainly used to practice installing the system, not afraid of causing damage to the real machine, and you can also experience the fun brought by different systems on the same real machine.