VSAM stands for Virtual Storage Access Method. VSAM runs and supported by MVS, ZOS and OS/390 operating systems. It was developed by IBM in 1970's. It is used to organize data in form of files in Mainframes. VSAM is mainly applicable in COBOL and CICS in Mainframes to store and retrieve data.
This tutorial is mainly useful for to understand the VSAM concepts and it gives basic understanding on VSAM to go to the next level.
To learn this tutorial one must have a basic understanding of JCL and COBOL. Having familiar with file handling method and VSAM concepts will be useful.