What is (conceptually) an API that runs on top of HTTP in JSON format?

Question

API

Got a test task to make an application with CRUD operations. There is also a task to make a filter on the created records that are displayed in the browser.
I am familiar with the json format from javascript, but you need to figure out what's what in PHP.

Answer 1

This is when you send a request to the server, for example GET /api/comments, and in response you receive JSON with comments, which you can parse and display on your front.