I have a question… What is the difference between jealousy and envy?

I looked up both words and these were the two definitions I found (I won’t tell you which is which):

• feeling resentment against someone because of that person’s rivalry, success, or advantages
• A feeling of discontent and resentment aroused by and in conjunction with desire for the possessions or qualities of another.

What is the difference?!?  Can someone explain what the difference is between these two words and the two definitions?

Thanks…