か (or)
or
Noun + か + Noun
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Between nouns, か means "or": コーヒーか紅茶, "coffee or tea". It offers a choice, and like と it only joins nouns and numbers: 二つか三つ, "two or three".
In speech the last item often gets か too: 月曜日か火曜日か, "(either) Monday or Tuesday".
For "or" between two whole questions, Japanese starts the second one with それとも: 行きますか、それとも帰りますか, "are you going, or heading home?"
Don't confuse it with the か that ends a question, or the か in 何か ("something"). All three are the same word doing neighbouring jobs: marking something as open or undecided.
Examples
コーヒーか紅茶はいかがですか。
Would you like coffee or tea?
月曜日か火曜日に行きます。
I'll go on Monday or Tuesday.
ペンか鉛筆で書いてください。
Please write in pen or pencil.
毎朝、パンかご飯を食べます。
Every morning I have bread or rice.
りんごを二つか三つ買ってください。
Please buy two or three apples.