Your is the second person possessive adjective, used to describe something as belonging to you. Your is always followed by a noun or gerund.
What is your name? Is this your pen? Your book is on the table. This is your chair and this is mine.
You’re is the contraction of “you are” and is often followed by the present participle (verb form ending in -ing).
You’re going to be late. Is that what you’re wearing? I think you’re lying. If you’re ready, we can go.