What is RestResource Annotation means in salesforce ?

Hi,

The @RestResource annotation is used at the class level and enables you to expose an Apex class as a REST resource.

These are some considerations when using this annotation:

1.The URL mapping is relative to https://instance.salesforce.com/services/apexrest/.
2.A wildcard character (*) may be used.
3.The URL mapping is case-sensitive. A URL mapping for my_url will only match a REST resource containing my_url and not My_Url.
4.To use this annotation, your Apex class must be defined as global.

Thanks.