What is REST?

Below are the link from where I learned about REST.

Link 1[^]

Link2[^]

If you get plenty of REST you'll be able to look it up yourself.

What is REST services?

Rest is stands for representational state transfer.Rest follows 5 rules
1.Every thing in form of resource rather a physical file
2.Every Resource is Identified by a Unique Identifier
3.Use Simple and Uniform Interfaces
4.Communication is Done by Representation
5.Be Stateless
Implementing 5 important principles of REST using WCF Services[^]