When a girl gets excited, her body can do some really cool things! Just like how a boy's penis can get hard, a girl's clitoris can get hard too. The clitoris is a special part of a girl's body that can feel really good when touched or stimulated. It's kind of like a little button that's right at the top of her private parts.
When a girl gets turned on, her body sends more blood to her clitoris, which makes it bigger and harder. This is called a clitoral erection. It's kind of like when you blow up a balloon - it gets bigger and fills with air. But instead of air, a girl's clitoris fills up with blood.
When a girl's clitoris is hard, it's more sensitive and can feel really good to touch or rub. It's like when you tickle a spot that feels really good and it makes you laugh. That's kind of like what happens when a girl's clitoris is touched and it feels really good.
So, a clitoral erection is just when a girl's body gets really excited and sends more blood to her clitoris, making it bigger and more sensitive. It's a totally normal and cool thing that happens to girls' bodies!