Websphere Commerce Maintneance packs & Feature Packs

1) Maintneance packs .
2) Feature packs  .
Maitenance pack :   WebSphere Commerce maintenance, includes fix packs and APARs (Authorized Program Analysis Report).
  APARs : An Authorized Program Analysis Report, or APAR, is a formal report to IBM development of a problem caused by a suspected defect in a current release of an IBM program. If IBM development is able to      confirm the existence of the defect they will update the APAR with any known workarounds and perhaps an indication of which future release .
Fixpack :Each WebSphere Commerce fix pack contains fixes for multiple APARs, to correct issues with the WebSphere Commerce product Applying Fix Pack 1 to Version 7.0.0.0 changes the version to 7.0.0.1. Fix packs are cumulative; for example when you install Fix Pack 2 you get all the fixes in both Fix Pack 1 and Fix Pack 2. Applying Fix Pack 2 to Version 7.0.0.0 changes the version to 7.0.0.2.
Feature Packs : WebSphere Commerce feature packs include NEW FEATURES to improve your WebSphere Commerce solution. These additions add new functionality to the WebSphere Commerce product. The feature pack differs from a fix pack in that it does not contain fixes to the base WebSphere Commerce product.
 Each WebSphere Commerce feature pack contains fixes for multiple APARs to correct issues with the WebSphere Commerce product.
Minimum fix pack levels for feature packs The following are the fix pack requirements for each WebSphere Commerce Version 7 feature pack:

FEATURE PACK ----- FIX PACK REQUIREMENTS
FEP1----WebSphere Commerce version 7.0.0.1 or higher
FEP2----WebSphere Commerce version 7.0.0.2 or higher
FEP3----WebSphere Commerce version 7.0.0.3 or higher
FEP4----WebSphere Commerce version 7.0.0.5 or higher
FEP5----WebSphere Commerce version 7.0.0.6 or higher
FEP6----WebSphere Commerce version 7.0.0.7

Source URL : http://pic.dhe.ibm.com/infocenter/wchelp/v7r0m0/index.jsp?topic=%2Fcom.ibm.commerce.install.doc%2Ftasks%2Ftig_tiginstall_fixpack.htm