What's a crush?

Today when Dad took me to the bus stop, one of the Mom's that lives a few houses down on our street gave him a reindeer Christmas Tree ornament for me. Her daughter, who is in Kindergarten, made them for gifts for some of her girlfriends and insisted on making me one too. She did not make one for any of the other boys on our street just me. Mom and Dad says this little girl has a crush on me. I like her for a friend, that's all. I don't know about this crush stuff. I'm only six. Either way though, she's really nice and I like the ornament. It was nice of her to think of me and make me one too.