Sap now deliever new functionality through Enhancement Packages.
The following thread answers your query:
Enhancements packages contains tens to hunderds of new or changed functionalites (called business functions). After installing an enhancement package you can activate the business functions which can be usefull to you.
To have an idea which business function can be usefull, you can use the business function prediction. Based on the (FI) transactions you use in the system, it gives an advice which business functions in an enhancement package should be activated.