Bcrypt is a password hashing function that incorporates salt to protect against rainbow table attacks and can dynamically adjust the cost of hashing to enhance security over time. It was designed specifically for securing passwords and is widely used due to its adaptive nature, making it increasingly more challenging to crack passwords as computing power increases. In this section, we delve into the mechanics of Bcrypt, its advantages over other hashing algorithms, and its common use cases within web applications and user authentication systems.