Human knowledge refers to the understanding and information that individuals acquire through experience, education, and observation. It encompasses various fields, including science, history, and art, and is often categorized into explicit knowledge, which can be easily communicated, and tacit knowledge, which is more intuitive and personal. This knowledge is built over time and shared through language, books, and technology. It allows societies to progress and innovate, leading to advancements in areas such as medicine, engineering, and philosophy. The collective knowledge of humanity is continually evolving as new discoveries and ideas emerge.