Some types of data you might put into a data set are:

• A program's source code
• Job control language statements
• Input to a program
• Output from a program
• Memos
• CLIST statements
• Text of a report

A data set is organized in one of several arrangements and is described by control information that the system can access. The two types of data sets most often used with TSO/E are:

• Sequential data set - A single unit with data arranged in a sequence, from top to bottom or beginning to end.
• Partitioned data set (PDS) - Subdivided unit that is divided into separately named, independent partitions called members, each of which can contain data. A partitioned data set has a directory that contains information about each member.