Hi,
ERP is a product in which SAP is one of the ERP software. JD Edward, BANN, peoplesoft, Oracle are some other ERP products
ECC is specific component of SAP which is a R/3 component. We have so many ECC versions till now such as 3; 4.0; 4.5b; 4.6c; 4.7, 5 and 6 version
Now all companies are going for upgrade their version to 6 which is in use right now across the industry