SAP has to provide the enhancement spots so that Customer can implement there.
1. Enhancement Point
2. Enhancement Section
From SAP Side:
Step1: Place the cursor at the line you plan to provide enhancement point and Create an Enhance Option.
Step2: Give enhancement point name and enhancement spot name.
Step3: Once the above parameters are given, there will be an enhancement point is created.
Step1 : Click enhance option.
Step 2: Place the cursor at point and create implementation
Step 3: Add the implementation code for the point.
This is all about Enhancement Point as part of Explicit Enhancements.