The loader component of z/OS, and the batch loader component of z/OS perform the same task. Given this, from here on the batch loader is referred to as the loader, unless otherwise stated.

The loader combines the basic editing and loading services, that can also be provided by the binder and program fetch, into one step. The loader accepts object modules and load modules, and loads them into virtual storage for execution. The loader does not produce load modules that can be stored in program libraries.

To keep a load module for later execution, use the binder.