This is the 25th most frequent German word.
oder
"Or" or "isn't it?" (used as a conjunction or tag question).
Here, "oder" is used as a tag question, seeking confirmation.
Das ist ein Apfel, oder?
That is an apple, isn't it?
In this sentence, "oder" provides a choice between two alternatives.
Du kannst entweder Pasta oder Salat wählen.
You can choose either pasta or salad.
In this context, "oder" is used as a conjunction to present an alternative in a question.