what exactly is a meme?

ok so wikipedia (the source of all internet knowledge...) says that it's an idea, behavior or style that spreads from person to person within a culture (like the internet...that's a culture, right...) basically, i just think they're freaking hilarious and every time i see one it's like I'm seeing one for the first time...(also i don't even know how to pronounce it, let alone what it is...)

(honestly laughed out loud)

(truth)