Was ist der Unterschied zwischen rufen und anrufen?
Both rufen and anrufen mean to call, so what is the difference between the two apart from anrufen being a trennbar verb?
The main difference is, that Anrufen always needs another person/object.
Most people will use the verb anrufen, in the meaning of to give somebody a call (via telephone), while rufen is used for calling or shouting in general.
Anrufen can be used when you are shouting at someone like in Duden's example
der Wachposten rief ihn an
in the meaning, that a guard shouts at someone (to get his/her attention).
or when you are asking for help, most likely a deity
Gott um Hilfe anrufen
Rufen on the other Hand doesn't need another person. It can be just an action
In den Wald hineinrufen
Ich rufe nach Hilfe