passieren
to happen
To occur, to take place. Describes an event or incident that happens.
Gestern ist auf der Autobahn ein Unfall passiert.
Yesterday, an accident happened on the highway.

to happen / pass
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to happen
To occur, to take place. Describes an event or incident that happens.
Gestern ist auf der Autobahn ein Unfall passiert.
Yesterday, an accident happened on the highway.

In the meaning 'geschehen' (to happen), 'passieren' always forms the perfect tense with the auxiliary verb 'sein' (to be), not with 'haben' (to have). This is an important exception for a verb that does not describe movement.
Was ist denn hier passiert?
What happened here?
When 'passieren' means 'geschehen' (to happen), the person something happens to is in the dative. The event itself is the subject of the sentence.
Dem Fahrer ist bei dem Unfall nichts passiert.
Nothing happened to the driver in the accident.
You can recognize the meaning from the context: Is it about an event ('Was ist passiert?' — What happened?), a place ('die Grenze passieren' — to pass the border), or food in the kitchen ('Tomaten passieren' — to strain tomatoes)?
Es kann immer mal ein Fehler passieren.
A mistake can always happen now and then.
When 'passieren' means 'vorbeigehen' (to go past) or 'überqueren' (to cross), it requires an accusative object. This object is the place that one passes.
Die Wanderer müssen noch eine schmale Brücke passieren.
The hikers still have to pass a narrow bridge.
The meaning 'durch ein Sieb streichen' (to press through a sieve) is used almost exclusively in the context of cooking and food preparation. The verb often appears in the passive voice.
Die gekochten Kartoffeln werden für das Püree passiert.
The cooked potatoes are strained for the purée.
to come
'kommen' and 'passieren' can both express that something happens. 'passieren' is used directly for events or incidents, often when something is unexpected. 'kommen' has many meanings; in the sense of 'to happen', it often appears in certain forms such as 'es kommt zu einem Problem' (a problem arises) or 'wie konnte das kommen?' (how could that happen?). Learners may confuse the words because both occur in contexts involving events. In everyday language, 'passieren' is usually more natural when you are simply asking or saying what happened. 'kommen' fits better in fixed expressions or when something occurs or comes about.

Auf dem Weg zur Arbeit ist ein kleiner Unfall passiert.
A minor accident happened on the way to work.
Nach dem Streit kam es im Team zu einem langen Gespräch.
After the argument, a long conversation took place within the team.