What is a crypto scanner & crypto screener?

Could you elaborate on the concept of a crypto scanner and crypto screener in the world of cryptocurrency? Specifically, I'm curious about how these tools function and what benefits they provide to investors and traders. Do they aid in identifying potential opportunities or risks in the volatile market? Could you describe how one might use them effectively in their daily trading or investment strategies? I'm also interested in knowing if there are any popular or highly recommended crypto scanners and screeners that you would recommend for beginners and experienced traders alike.