
der Auslöser
trigger
The immediate cause or reason that sets an event, action, or reaction in motion.
Der Auslöser für den Streit war eine unbedachte Bemerkung.
The trigger for the argument was a careless remark.
trigger
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trigger
The immediate cause or reason that sets an event, action, or reaction in motion.
Der Auslöser für den Streit war eine unbedachte Bemerkung.
The trigger for the argument was a careless remark.

shutter button
The button on a camera that you press to take a photo.
Warte auf den perfekten Moment und drücke dann den Auslöser.
Wait for the perfect moment and then press the shutter button.

trigger mechanism
A technical mechanism that starts a process, for example in a trap or an alarm.
Die Mausefalle funktionierte nicht, weil der Auslöser klemmte.
The mousetrap didn't work because the trigger mechanism was stuck.
'Der Auslöser' (the trigger) is the noun derived from the verb 'auslösen' (to trigger/to cause). The ending '-er' here refers to the thing or mechanism that triggers something.
Ein lauter Knall löste den Alarm aus.
A loud bang set off the alarm.
The context helps you recognize the meaning. In connection with cameras and photography, it means the button. With conflicts or events, it means the cause. With technical devices such as traps or alarms, it is a mechanism.
Der Auslöser der Kamera klemmt.
The camera's shutter button is stuck.
In the meaning 'Ursache' (cause), 'Auslöser' (trigger) is very often used with the preposition 'für' (for) and the accusative. The pattern is: der Auslöser für etwas sein (to be the trigger for something).
Stress kann ein Auslöser für viele Krankheiten sein.
Stress can be a trigger for many illnesses.
In the context of photography, the fixed combination 'den Auslöser drücken' (to press the shutter button) is very common. It means to take a photo.
Ich habe im richtigen Moment den Auslöser gedrückt.
I pressed the shutter button at the right moment.
reason / occasion
Anlass and Auslöser can both refer to something that sets an action or reaction in motion. Anlass tends to emphasize the specific external reason, while Auslöser emphasizes the factor that directly starts it. Choose Auslöser when the immediate beginning is especially important.

Eine neue Beschwerde war der Auslöser für das sofortige Treffen.
A new complaint was the trigger for the immediate meeting.
Die Beschwerde der Nachbarn war der Anlass für das Treffen.
The neighbors’ complaint was the reason for the meeting.