What is bitcoin clicker?

I've recently encountered a concept called 'bitcoin clicker' in my cryptocurrency research, but I'm still quite unclear about its exact nature. Could you please elaborate on what bitcoin clicker is? Is it a tool, a game, or a service? If it's a tool, how does it work and what are its main functions? If it's a game, what kind of gameplay does it offer and how does it relate to bitcoin? Lastly, are there any risks associated with using bitcoin clicker, and if so, what are they? I'd appreciate a concise yet comprehensive explanation to help me understand this concept better.