The technical foundation that enables SAP applications to function. It consists of middleware programs and tools that support the interoperability and portability of SAP applications across systems and databases.

Commonly described as a set of programs and tools that act as an interface with Database, Operating system, Communication protocols and business applications (such as FI, CO, MM,etc). Full form of BASIS is “Business Application Software Integrated solution”

It is essentially the system administration platform for SAP environments from SAP R/3 through SAP S/4HANA. Its purpose is to make sure that all SAP systems in the environment run smoothly and consistently. 

SAP applications such as FI,CO,PP etc. can run and communicate with each other across different Operating systems and Databases with the help of BASIS.