| REST- Representational State Transfer |
AJAX - Asynchronous javascript and XML |
| REST has a URI for accessing resources by means of a request-response pattern. |
AJAX uses XMLHttpRequest object to send requests to the server and the response is interpreted by the Javascript code dynamically. |
| REST is an architectural pattern for developing client-server communication systems. |
AJAX is used for dynamic updation of UI without the need to reload the page. |
| REST requires the interaction between client and server. |
AJAX supports asynchronous requests thereby eliminating the necessity of constant client-server interaction. |