Exec or program. An executable program, i.e. a binary file which may be run independently of other programs. Commonly the term program is found in user documentation, and exec in comments and GDB internal documentation.

Inferior. A GDB entity representing a program or exec which has run, is running, or will run in the future. An inferior corresponds to a process or a core dump file.

Address space. A GDB entity which can interpret addresses (that is values of type CORE_ADDR). Inferiors must have at least one address space and inferiors may share an address space.

Thread. A single thread of control within an inferior.