A process is a running instance of a program, together with its memory, credentials, open resources, and execution state. Linux identifies each live process with a numeric process ID, or PID. A PID is unique among processes that exist at the same time, but the kernel can reuse it after a process exits.
Processes · Lesson 1
ps (Processes)
Learn how to take process snapshots with `ps` and monitor changing activity with `top`.