In modern day society, it seems to me that people, specifically the younger crowd (teenagers and college students), do not know the difference between your and you're. As a result, I've decided to point out the difference, hoping that fewer people will make this common grammatical mistake. Sure, it may be daunting at first, but it's very simple.
The word "your" is used to show possession.
Correct Usage: Your car is very cool.
Incorrect Usage: Your welcome.
"You're" is a contraction, which means that it is a shortened form of "you are."
Correct Usage: I hope you're understanding this.
Incorrect Usage: You're cat is lost.
Hopefully, you know the difference between them. Now, you can show the world your ability to utilize correct grammar. Please, spread the word to your family and friends, so we can eradicate this grammatical error.