Your? You’re? So, which is it? This culprit is spotted often, both in the blogosphere and in printed material. When in doubt, consider how the word is being used.
Your is second person possessive, used as an adjective to describe a noun.
Are these your pretzel M&M’s that I’m about to eat?
Your customers should be treated with great respect.
You’re is a contraction of “you are,” so if you could use the two words separately in a sentence, feel free to replace them with “you’re” instead.
You’re very smart to cash in on this deal so quickly.
You’re not going out of the house wearing that, are you?
When in doubt, if you can replace the word in question with “you are,” then go with “you’re.” Otherwise, it’s “your.”