Cad quickly sees the difference between verification code and password.

Difference: 1) In terms of cost: Generally speaking, the picture verification code has no cost, and it can be realized only through a set of programs in the website or app, while the SMS verification code has a cost and needs to be realized by calling a third-party SMS verification code interface. Although the SMS verification code interface is free, there is a charge for sending verification code messages. The price of each SMS verification code is about 3 cents to 6 cents, which is paid by the website or app developer.

2) In essence, the picture verification code is mainly used to distinguish between people and machines, for example, to prevent some users from using software to register in large quantities; SMS verification code mainly verifies the identity of users, which can greatly reduce repeated registration and illegal registration and increase the number of real users of websites or apps. In other words, the "short message verification code" verifies the user himself, while the "graphic verification code" verifies that the user is a person rather than a machine.

3) In the presentation mode: the picture verification code is generally presented as a picture, and the user clicks on the picture verification after recognition, while the SMS verification code is presented by sending the verification code to the user's mobile phone, and the user inputs the verification after obtaining it. It is worth noting that the two are usually used in combination.