Dear Saroj,
SAP stands for Systems Applications and Products, where the entire HR structure is converted into SAP structure. SAP is an ERP component, offering numerous career prospects in HR for those trained in SAP-HR. Overall, it represents a systematic approach in HR. There is much to learn about it as I recently joined the course this week. For more details, browse through a search engine like www.Google.com.
Good luck.
Cheers!!! Sreeni