SRM: This stands for Supplier Relationship Management.
It's very effective for the companies that have large number of users whom directly can purchase the material by using the Shopping Cart screen for which the materials can be chosen from the obtainable Catalogs.
It's extended form of ERP where data gets transferred among SAP R/3 and the SRM screen (vice versa) that will work in Internet so that the every Vendor coordination will be more better and which will completely avoid the paper work and unnecessary confusions.