To be playful, too nice or caring with someone.

Playful banter usually, but not restricted, with members of the opposite sex. This usually includes a conscious desire to flatter the one being flirted with. Flirting is a core aspect of many relationships today between a boy and a girl.

Girls are often caught flirting with each other. In this context, it is usually not intended sexually but playfully.

Nearly all accounts of flirting include subtle sexual innuendos and, to the unexperienced, can sometimes seem harmless.

unnecessary taunting or talking to a person in order to recieve their attention

"You have to say something that peaks their interest without giving them any concrete ideas."

Includes possible sexual innuendos to obtain a result.

According to my ex:

Flirting is having friends and making them laugh. And if someone “flirts” with you (makes you laugh) while you’re in a relationship with someone, then you’re a cheater :)

A girl you talk to that you love

Ancient warfare women use to destroy men by inflating or deflating men’s egos in order to make them feel attractive or inadequate.

Also known as seduction.