What does flirting look like anyway?

No, seriously. What is flirting?

I've never been in a relationship, nor have I ever wanted to. But I have always wondered: what forms can flirting take? (After all, I have occasionally had girls think I'm hitting on them when I am just trying to get to know them, and that can get awkward).

Me, I often can't tell if two people are flirting unless it's as obvious as "You're gorgeous" or "Hey baby, wanna have sex?" And it is more than possible for a guy and girl to just be friends and spend time together without any romantic or sexual interest from either side.

So for those who have actually done it: how do you flirt? What does flirting look like? What are some subtle things that can be interpreted as flirtatious?
What does flirting look like anyway?
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