der Schluss
end
The end or final part of something.
Zum Schluss der Veranstaltung gab es ein großes Feuerwerk.
At the end of the event, there was a big fireworks display.

end / conclusion
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end
The end or final part of something.
Zum Schluss der Veranstaltung gab es ein großes Feuerwerk.
At the end of the event, there was a big fireworks display.

'Der Schluss' (the end / conclusion) is the noun related to the verb 'schließen' (to close). The basic idea of closing or ending is found in all meanings.
Bitte schließen Sie die Tür, wenn Sie gehen.
Please close the door when you leave.
The expression 'Schluss machen' has two main meanings. 'Mit jemandem Schluss machen' means to end a relationship. 'Schluss machen' without an object or with 'für heute' means to end work or an activity.
Sie hat letzte Woche mit ihrem Freund Schluss gemacht.
She broke up with her boyfriend last week.
To describe the end of something, the expressions 'am Schluss' or 'zum Schluss' are used. Both mean 'at the end' or 'lastly'.
Am Schluss des Films haben alle geweint.
At the end of the film, everyone cried.
When 'Schluss' (conclusion) means a logical conclusion, it is almost always used in fixed expressions. The most common are 'einen Schluss ziehen' (to draw a conclusion) or 'zu einem Schluss kommen' (to come to a conclusion).
Aus diesen Fakten kann man nur einen Schluss ziehen.
From these facts, one can draw only one conclusion.
The expression 'Schluss damit!' (stop it!) is a direct command to stop an action immediately. It is often used in an annoyed or strict tone.
Hört auf zu streiten, jetzt ist Schluss damit!
Stop arguing—stop it now!
end
'das Ende' and 'der Schluss' can be very similar when referring to the final part of something. With a film, a text, or an event, you can often use both words. 'das Ende' is a bit more general and also fits many situations where something is simply over. 'der Schluss' often sounds like the final section or the deliberate conclusion of something. Learners may confuse the words because they often seem interchangeable. The important point is: for spatial things, you are more likely to say 'das Ende', for example 'das Ende der Straße' (the end of the street), not 'der Schluss der Straße'.

Der Schluss der Geschichte war traurig, aber sehr schön geschrieben.
The ending of the story was sad, but very beautifully written.
Nach dem Essen war der lange Tag endlich zu Ende.
After the meal, the long day was finally over.