Final answer:
A non partitioned data set refers to records stored in physical order without being divided into segments, allowing for simpler management but potentially less efficient access and processing compared to partitioned data sets.
Step-by-step explanation:
A non partitioned data set describes a collection of one or more records that is stored in physical order. This means that the records are organized in the order in which they are written to the storage device, without being divided into separate segments or partitions. Non partitioned data sets can be easier to manage because they are stored as a single unit. However, they may not offer the same level of organization or performance benefits as partitioned data sets, which divide data into separate, manageable parts that can be accessed and processed more efficiently.