der Snack
snack
A small meal eaten between main meals.
Für den kleinen Hunger am Nachmittag habe ich immer einen gesunden Snack dabei.
For a little afternoon hunger, I always have a healthy snack with me.

snack
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snack
A small meal eaten between main meals.
Für den kleinen Hunger am Nachmittag habe ich immer einen gesunden Snack dabei.
For a little afternoon hunger, I always have a healthy snack with me.

'Snack' is a word from English that has been fully adopted into German usage. It is used, as in English, for a small meal between meals.
Im Büro habe ich immer einen kleinen Snack in der Schublade.
At the office, I always have a small snack in my drawer.
Common verbs used with 'Snack' are 'essen' (to eat), 'sich machen' (to make oneself), or 'nehmen' (to take). Typical adjectives are 'klein' (small), 'schnell' (quick), or 'gesund' (healthy).
Vor dem Sport esse ich oft noch einen schnellen Snack.
Before exercising, I often eat a quick snack.
The word 'Snack' is often mentioned together with the reason for the small meal. Typical phrases are 'ein Snack für zwischendurch' (a snack between meals) or 'ein Snack für den kleinen Hunger' (a snack for when you're a little hungry).
Ein Apfel ist ein guter Snack für zwischendurch.
An apple is a good snack between meals.
refreshment / strengthening
'Stärkung' and 'Snack' can both refer to a small meal between larger meals. 'Snack' is a very general word for something small to eat, for example fruit, nuts, or a bread roll. 'Stärkung' sounds more focused on the purpose: you eat or drink something in order to get your energy back. The words can be confused because the same thing can be both. A granola bar is a 'Snack'; after a tiring trip, it can also be a 'Stärkung'.

Wegen des langen Unterrichts steckt Paul immer einen kleinen Snack in die Tasche.
Because of the long class, Paul always puts a small snack in his bag.
Vor der Prüfung nahm Sofia noch eine Banane als Stärkung mit.
Before the exam, Sofia took a banana with her for a little energy boost.