
der Ausflug
excursion
A short trip or outing, usually taken for pleasure and often lasting only one day.
Am Wochenende machen wir einen Ausflug an den See.
At the weekend, we're taking an excursion to the lake.
excursion / digression
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excursion
A short trip or outing, usually taken for pleasure and often lasting only one day.
Am Wochenende machen wir einen Ausflug an den See.
At the weekend, we're taking an excursion to the lake.

digression
A brief thematic digression from a main topic in a conversation, text, or lecture.
Nach diesem kurzen Ausflug in die Geschichte kehren wir nun zum eigentlichen Thema zurück.
After this brief digression into history, we will now return to the actual topic.
The word 'Ausflug' (excursion/digression) is composed of 'aus' (out) and 'Flug' (flight). Figuratively, it describes that you 'fly out' of everyday life for a short time in order to experience something pleasant.
Für Sonntag ist ein Ausflug in die Berge geplant.
An excursion to the mountains is planned for Sunday.
An 'Ausflug' (excursion) is typically 'gemacht' (made/done). So you say 'einen Ausflug machen' (to take an excursion). The destination is often indicated with prepositions such as 'an', 'in', or 'zu'.
Lass uns am Samstag einen Ausflug an den Badesee machen.
Let's take an excursion to the swimming lake on Saturday.
You can recognize this figurative meaning by the fact that it is not about a place, but about a topic. Signal words include 'Geschichte' (history), 'Philosophie' (philosophy), or 'Thema' (topic).
Der Professor machte einen kurzen Ausflug in die römische Geschichte.
The professor made a brief digression into Roman history.
The meaning 'Abschweifung' (digression) is mainly used in written language, in lectures, or in formal discussions. In normal everyday conversation, it is rather rare.
Bevor wir zum Hauptpunkt kommen, gestatten Sie mir einen kleinen Ausflug in die Statistik.
Before we come to the main point, allow me a small digression into statistics.
journey / trip
Reise and Ausflug both refer to a temporary change of location. A Reise can last longer and include a longer stay. An Ausflug is typically short, is usually for pleasure, and often ends with returning home that same day.

Am Sonntag machen wir einen Ausflug an die Nordsee und kehren abends zurück.
On Sunday, we are taking a day trip to the North Sea and returning in the evening.
Im Sommer machen wir eine zweiwöchige Reise an die Nordsee.
In summer, we are taking a two-week trip to the North Sea.