Difference between implicit enhancement and explicit enhancement

What is the difference between implicit enhancement and explicit enhancement .

Hi Peters,
Implicit enhancement option
Throughout the ABAP system, enhancement options are automatically available at certain pre-defined places. Some of the implicit options are:
u2022 At the end of all the programs (Includes, Reports, Function pool, Module pool, etc.), after the last statement
u2022 At the beginning and end of all FORM subroutines
u2022 At the end of all Function Modules
u2022 At the end of all visibility areas (public, protected and private) of local class
To view all the implicit options available in a source code, choose u2018Edit -> Enhancement Operations -> Show Implicit Enhancement Optionsu2019 from the editor.
Befor that you click on the spiral icon button in the application toolbar
Explicit enhancement option
The Implicit enhancement options are provided at specific source code places explicitly by SAP (Note that these enhancement definitions can also be created by partners and customers in their code).
There are two types of Explicit Enhancement options available. One which can be provided at a specific place - called Enhancement Point, and another which can be used to replace a set of statements u2013 called Enhancement Section. For this, we now have two new ABAP statements, viz.
u2022 ENHANCEMENT-POINT
u2022 ENHANCEMENT-SECTION
When the Enhancement-Section is implemented, only the implementation gets executed and the original code doesnu2019t get executed. This is a new technique, which didnu2019t exist previously in any of the old ways of enhancing, to exclude any standard SAP code from execution. Because of this, there can be only one active implementation of an Enhancement-Section. On the other hand, there can be multiple active implementations of an Enhancement-Point, in which case all the implementations will be executed with no guarantee in the order of execution.
For more information check the following link
[http://help.sap.com/saphelp_nw70/helpdata/en/94/9cdc40132a8531e10000000a1550b0/frameset.htm]
Thanks,
Surya

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