Was in a conversation about gender, this came up, and I realised I don't have any kind of firm grasp on it.

I've looked at a some articles, but I'm not really getting it still.

I'm usually only a semi-idiot at worst, but I'm just not good at absorbing info about gender related matters. I'm a bit too aggravated to be able to take it in properly. So ELI4, even.

Does it exist?

If so, what are the main contextual factors to understand?

Or any other useful angle on it. Thanks!