Answer 1

API: Application Program Interface which response with GET and POST method. When a user gives input the POST method will store the data in to the database or gives the JSON or XML data to server. When you want to retrieve some data by calling with GET method, JSON or XML data will return.

Library: To easy the manual coding or where the function is already created. It integrates into a package.

Package: Importing a package will give you to the authority to access the library under it.

Module: I don't know at this moment.

Script: Script is where you write your codes.