add ajax content (#2515)

content/roadmaps/113-qa/content/103-qa-automated-testing/100-frontend-automation/100-basic-introduction/ajax.md

@@ -1 +1,8 @@
-# Ajax
+# Ajax
+
+AJAX stands for Asynchronous JavaScript And XML. In a nutshell, it is the use of the XMLHttpRequest object to communicate with servers. It can send and receive information in various formats, including JSON, XML, HTML, and text files.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink badgeText='Read' colorScheme='yellow' href='https://www.w3schools.com/whatis/whatis_ajax.asp'>What is AJAX?</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Web/Guide/AJAX/Getting_Started'>Getting started</BadgeLink>
+<BadgeLink badgeText='Watch' colorScheme="yellow" href='https://www.youtube.com/watch?v=3l13qGLTgNw'>What Is Ajax?</BadgeLink>