Explain about Rest API and Graph API in SharePoint

As the Main Difference Lies in the Scope of the Data Source.
SharePoint Rest API designed to work specifically with SharePoint sites and content.
While Microsoft Graph API is a more general API that can be used to access data from various Microsoft 365 services.

SharePoint REST API:

• An architectural style for web services.
• Allows communicating between two software programs through HTTP.
• You can use different methods/verbs like GET, POST, PUT and DELETE
• It is essentially based on the user context.

Graph Api in SharePoint:

• Allows accessing the SharePoint data but not only data. you can access the wide resources provided by MS365 Tenant.
• It is based on the entire environment.
• It becomes useful when you wish to link several resources types in one point.