Is it correct to say "your welcome"?

Excuse me, I've come across a phrase that I'm not entirely sure about. I've heard people say "your welcome" as a response to someone saying "thank you". But I'm wondering, is it actually correct to use "your" in this context? Or should it be "you're welcome"? I'd appreciate any clarification you can provide on this matter. It's just that I want to ensure that I'm using proper grammar and etiquette when engaging in conversations.