A computer virus is a type of computer virus that is hidden in a computer system.

Computer virus is a type of disruptive program hidden on the storage medium in the computer system that is deliberately damaging.

## Computer virus (Computer Virus) is inserted into a computer program by the programmer to destroy computer functions or data. Code is a set of computer instructions or program code that can affect the use of a computer and can replicate itself.(Recommended learning:web front-end video tutorial)

Computer viruses are contagious, covert, infectious, latent, excitable, expressive or destructive. The life cycle of a computer virus: development period → infection period → incubation period → attack period → discovery period → digestion period → extinction period.

Computer viruses are artificially created, destructive, contagious and latent programs that damage computer information or systems.

It does not exist independently, but is hidden in other executable programs. When a computer is infected with a virus, it may affect the running speed of the machine at first, or crash and damage the system at worst. Therefore, the virus brings great losses to the user. Under normal circumstances, we call this destructive program a computer virus.

Storage media refers to the carrier that stores data.

Such as floppy disk, optical disk, DVD, hard disk, flash memory, U disk, CF card, SD card, MMC card, SM card, Memory Stick, xD card, etc. Popular storage media are based on flash memory (Nand flash), such as U disk, CF card, SD card, SDHC card, MMC card, SM card, memory stick, xD card, etc.

#Digital cameras convert image signals into data files and save them on magnetic media devices or optical recording media. If a digital camera is the host of a computer, then the memory card is equivalent to the hard drive of the computer. In addition to recording image files, the storage memory can also record other types of files. When connected to a computer via USB, it becomes a mobile hard drive.

There are more and more media used to store images. How to choose the appropriate storage media is very important for digital photographers, especially professionals engaged in digital photography.

When choosing storage equipment, consider:

The price of the equipment and removable media;

The amount of information that can be stored;

The service life of storage media;

The speed of reading and writing information from the disk, that is, the data transfer speed determined by the drive.

Common storage media on the market include CF cards, SD cards, SM, memory sticks and small hard drives.

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