Open Data Protocol – OData

OData is a specification which defines how AtomPub is used to standardize a typed, resource-oriented CRUD interface for manipulating data sources. oData has many standard supported almost all the data type which are supported by .net clr.
OData shows a more detail information and more realistic usage of service written on the oData specification.

MSDN Link : Click Here
OData Link: Click Here

In-nutshell oData is a simple REST full implementation of services for handling business layer and interacting with n-client.