What is the verification code for? Why should I enter the verification code?

CAPTCHA is the abbreviation of "automatic public Turing test to distinguish between computer and human", and it is a public * * * automatic program used to distinguish whether the user is a computer or a human. \x0d\ can prevent: malicious batch registration, malicious password cracking, ticket brushing, and forum flooding, and effectively prevent hackers from constantly trying to log in to a specific registered user by using a specific program brute force cracking method. \x0d\\x0d\ says that the computer will produce a verification code question (a picture is usually generated by a series of randomly generated numbers or symbols), but this verification question is unrecognizable by the computer itself, and only humans can answer it, so the computer can judge whether a person is operating or a machine is operating according to the input of the verification code. So as to play a preventive role. \x0d\\x0d\ Common verification codes are GIF animation verification code and SMS verification code. With the development of technology, computers can slowly crack some conventional verification codes, so it is necessary to use more advanced algorithms and methods to generate verification codes. The common way is to add some interference to the verification code, such as drawing a few lines randomly and drawing some points. In fact, it is to prevent the computer from automatically recognizing them, which also makes the verification code sometimes invisible to people (so it is very common.