What does Deribit do?

Can you tell me more about Deribit? I'm curious about the specific services they offer and how they operate within the cryptocurrency space. I've heard they're a well-known player in the derivatives market, but I'd like to get a better understanding of what sets them apart and what types of financial instruments they specialize in. Are they solely focused on Bitcoin derivatives, or do they offer products for other cryptocurrencies as well? Additionally, I'm interested in their trading platform and any unique features it may have that cater to the needs of professional traders and investors.