About sql join keywords

Hi
This is Gaurav Gumber from mumbai. I have a question about sql joins.
If you can help me than please reply me. My email is [email protected]
My question is that. We use left outer join and right outer join and full outer join key words to do join. What are the other key word. In Interview was asked this question and he was tell me that there are five type for the same. What are these can you help me.