What is the name of the script system that makes you read links in social networks?

Question

Programming

For example, you throw a link in VK or Ok.com, the system immediately reads it, and somehow pumps the title and description of the site and another photo.
How did they do it?

Answer 1

Are you seriously? Do you want us to send you sorts or something? :D
These modules are written by pens and there are no ready-made scripts.
Google, study web technologies + their connection with languages ​​like C, C# and implement the same. Perhaps I am wrong, I will not argue, but such interactions seem to be implemented with the help of normal programming languages!
PS Always surprised by such delusional questions. How do I write a social network? How can I write a cool browser game like mail.ru? Learn the equipment, practice, team up with other programmers and create your own powerful projects.

Answer 2

We catch the test field change events when we see something similar to a link in it - we send a request to the server, on the server we download the page using this link, parse it, return the necessary data to the client.
I don't quite understand what the question is, I need clarification.