SAP provides optionally installable Enhancement Packages which allows you to get innovations including new functional enhancements, simplifications, ES(Enterprise Services) Bundles on top of SAP ERP 6.0 without upgrading system. In terms of effect, SAP Enhancement packages are lightweight compared to upgrades. You can view Enhancement Package contents by visiting SAP Service Marketplace. EhPs are cumulative, that is they are built on top of each other. E.g, Installation of Enhancement Package 4 covers also previous EHP1, EHP2 and EHP3, so you don’t need to install previous packages seperately. Most common confuse about EHPs is of its function with Support Packages. EHPs are optional and contain new functionalities while Support Packages are mandatory and contain bug fixes.
