What is a bot scammer?

Could you please explain what a bot scammer is? I've heard the term mentioned in relation to cryptocurrency and finance, but I'm not entirely sure what it entails. Are these individuals or automated programs that target unsuspecting users with fraudulent schemes? How do they operate, and what are some of the common tactics they employ to deceive people? Additionally, what steps can individuals take to protect themselves from falling victim to a bot scammer?