I bought many extension from somewhere.In whole document they mentioned compilation process. Basically I want to know that magento compilation , what the mean of that and what task being done by magento during compilation process..
Deepak,basically compilation process has been speed up the system.
By using Compilation
process magento reduce Codepool files(local,community,Core),thus make system.
According compilation,magento is copy it modules core files
at includes/src files.
This process magento is
only copy active modules code files(Core,community,local)
Good describe at flyingmana answer