mySAP is not a single product but is a suite of products from SAP including SAP R/3.
SAP R/3 was First launched in 1998 , is regularly updated ,and is market leader in ERP category till date.
SAP R/3 many modules such as HR , Finance , MM covering all enterprise Functions
“3″ stands for three tier architecture – Presentation tier , Logic tier and Data tier.
Other products in the mySAP product suite includes
SRM(Supplier Relationship Management),
CRM(Customer Relationship Management),
PLM(Product Lifecycle Management ) ,
SCM (Supply Chain Management)
Note: It was reposted from http://www.saptraininghub.com/what-is-mysap/