それとも
or (in a question)
Question か。それとも、Question か。
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それとも offers a choice between two questions: コーヒーにしますか。それとも、紅茶にしますか, "would you like coffee, or tea?"
It's only for questions. Each half is usually a question with か, or with rising intonation in casual speech: 電車で行く?それとも、バス?
Compare か (N5), which joins two nouns directly (コーヒーか紅茶), and または, "or" in statements, instructions and forms: 電話またはメールでご連絡ください.
It's also a way to check what someone meant: 本当なの?それとも、冗談?, "are you serious, or joking?"
In a grammar question, the clue is the question mark: if both halves are asking something, and the listener has to pick one, the answer is それとも. If it's a statement or a list, it's か or または.
Examples
コーヒーにしますか。それとも、紅茶にしますか。
Would you like coffee, or tea?
電車で行く?それとも、バス?
Shall we go by train, or by bus?
今日にしますか、それとも明日にしますか。
Shall we make it today, or tomorrow?
映画を見る?それとも、買い物に行く?
Want to see a film, or go shopping?
本当なの?それとも、冗談?
Are you serious, or is it a joke?