Implicit knowledge is when you know something without even realizing that you know it. It's like when you ride your bike without thinking about how to balance or change gears, or when you speak your native language without consciously thinking about grammar or vocabulary. This knowledge is stored in your brain, and you can access it automatically without having to consciously think about it. It's different from explicit knowledge, which is knowledge that you can explain or articulate. For example, you can explicitly explain how to tie your shoes, but you do it implicitly without even thinking about the steps involved. Implicit knowledge can be learned through experience, observation, and practice.