How to access the site through VK ID?

Question

PHP

There is a site that has a main page with the "Login" button, and the rest of the content is blocked, when you click on the button, it is prompted to log in using VK, then if it successfully logged in, it checks if its ID is in the database, and if so, it is successful gets to the site.
What technology is used to implement this?

Answer 1

The term "authorization" means granting access (for example, to a user to content, or an application to user data or api functions).
The term "authentication" (authentication) means confirmation of identity (for example, a user, or an application, or a site).
Vkontakte can authenticate your site using a secret key.
Vkontakte can authenticate the user by his login and password.
The user can authorize your site to access his data, at his own discretion and paranoia.
Your site can authenticate the user based on the contact details.
Your site can authorize the user to view the content, according to your logic.
The first three points are made using the OAuth protocol described in the VKontakte documentation.
If you don't understand, you don't need a toaster, but a freelance.

Answer 2

*cry*

Answer 3

1. Habrahabr / Authorization via VKontakte
2. VKontakte / Authorization based on OAuth 2.0
3. VKontakte / Authorization via Open API