I have 3 questions that cause me to conflict and not understand their terminology

I am new to Angular and I have an initial understanding of the special basics and these questions are facing me and I want to understand them well. I've been reading around trying to understand what RESTful API is all about.

1- In Angular, can we say about (Fetch Data Using HTTP Client With Angular) it is an Api or Rest

2 - Using Json obj taken from a page that gives us the obj and using the data in it and showing it in my web page Can it be called using api

3- Is the creation of the API related to the tasks of front-end or back-end in the case of dealing with the framework of Angular

I will answer simple to you and shortly:

1. RESTful transfers a representation of the state of the resource to the requester or endpoint. Check it out for more info here REST API

2. API stands for (application programming interface) is a connection between computers. It is a type of software interface, offering services to other pieces of software.

HttpClient in Angular is a module helping developers to do http requests to that API for accessing/manipulating recourses.

Keep going, hope to help you a little bit.