restart defines when a terminated child process must be restarted.

• A permanent child process is always restarted.
• A temporary child process is never restarted (even when the supervisor's restart strategy is rest_for_one or one_for_all and a sibling's death causes the temporary process to be terminated).
• A transient child process is restarted only if it terminates abnormally, that is, with another exit reason than normal, shutdown, or {shutdown,Term}. https://erlang.org/doc/man/supervisor.html