In general, a yes-no question in French can be formed in different ways:

General question (question générale):

Est-ce que tu parles français ? (Do you speak French?)

Alternative question (question alternative):

Parles-tu français ou anglais ? (Do you speak French or English?)

Tag question (question tag, question complément):

Tu parles français, n'est-ce pas ? (You speak French, don't you?)

Each type of question serves a different purpose and can be used to elicit specific information from the person you are speaking to.