ABAP Enhancement Framework allows you to add more fixed values to the domain by using the Fixed Value Append on any standard or custom domain.

As part of the ABAP Enhancement Framework, you can also now create the new index as Index extension on any standard or custom table.

Similar to Append Structure, you can also enhance the Search help using the Append Search Help as part of the ABAP Enhancement Framework.

Tables or Structures can be enhanced as part of the Enhancement Framework using the Append structure option available in Data Dictionary.

To be able to enhance the table properly, you would need to understand Table Enhancement Category for that table.

Way to enhance the Function module to have additional logic. Functional enhancement can also be used for adding additional optional parameters in the FM Signature.