"Lean in" means to be confident and proactive in pursuing your goals, especially in areas where women or marginalized groups are underrepresented or face discrimination. It's like when you are playing a game and you want to win, you need to be determined and work hard to achieve your goal. It means speaking up and taking action to get what you want, even if it's uncomfortable or challenging. It's important because if we don't lean in, we may miss out on opportunities and not achieve our full potential. Remember, you can do anything you set your mind to, and leaning in is all about believing in yourself and going for it!