What are the Ajax functions why we use them?

Related questions

1. What is Ajax and where it is used?
2. What is a synchronous request?
3. What is synchronous vs asynchronous?
4. What is window ActiveXObject in JavaScript?
5. What is the use of XMLHttpRequest?
6. Is REST API synchronous or asynchronous?

Tags

1. #objects
2. #asynchronous
3. #directly
4. #server
5. #either
6. #services
7. #return
8. #pages
9. #xmlhttprequest
10. #object
11. #acronym
12. #these
13. #originally
14. #javascript