What is the Difference between WebLink and overrideAction in Salesforce?

Hello Anurag,

WebLink:
Represents a custom button or link defined in a custom object.
This type extends the Metadata metadata type and inherits its fullName field.

ActionOverride:
Represents an action override on a standard or custom object. Use it to create, update, edit, or delete action overrides. You can access ActionOverride only by accessing its encompassing CustomObject. Action overrides are defined as part of a standard or custom object.

Thanks.