GET and POST Action Types in MVC

Here is the difference you should know:
1. HTTPGet method is default whereas you need to specify HTTPPost attribute if you are posting data using HTTPPost method.
2. HTTPGet method creates a query string of the name-value pair whereas HTTPPost method passes the name and value pairs in the body of the HTTP request.
3. HTTPGet request has limited length and mostly it is limited to 255 characters long whereas HTTPPost request has no maximum limit.
4. HTTPGet is comparatively faster than HTTPPost. HTTPPost takes extra time in encapsulating the data.
5. HTTPGet can carry only string data whereas HTTPPost can carry both string and binary data.
6. HTTPGet method creates readable url so it can be cached and bookmarked whereas such facility is not available in HTTPPost method.

For More Detailed information you can visit here.

Both GET and POST method is used to transfer data from client to server in HTTP protocol but the Main difference between the POST and GET method is that GET carries request parameter appended in URL string while POST carries request parameter in message body which makes it more secure way of transferring data from client to server in HTTP protocol.

To know more detailed information visit this post.