Okay kiddo, a nanny is a person who helps take care of you and your siblings when your parents are busy or not around. Think of her like a super cool aunt who comes over to play with you and make sure you eat your veggies.
She might come to your house every day or just a few times a week, and she'll usually have some special skills that help make her an awesome caregiver. For example, she might be really good at reading stories, playing games, or helping you with homework. She might also know how to cook your favorite meals or make a mean PB&J sandwich.
While your nanny is taking care of you, she'll also be keeping an eye on your safety and making sure you don't get into any trouble. She'll help you follow your parents' rules, like brushing your teeth before bed and putting your toys away when you're done playing.
Nannies are pretty amazing people, and you're lucky to have one! Just remember to be respectful and listen to her when she's talking to you, and try to have fun and be on your best behavior when she's around.