Here's a breakdown:
* Attraction: You find them physically appealing, and maybe their personality or sense of humor is attractive too.
* Interest: You are intrigued by them and want to spend more time with them.
* Flirtation: You might playfully tease them or show them subtle signs of affection.
* Not necessarily romantic: It's possible to fancy someone without wanting a serious relationship.
Think of it like a spark or a crush - a positive feeling that doesn't necessarily have to lead to anything specific.