What is DFX function?

I'm curious, can you elaborate on the DFX function? I've heard it mentioned in the context of cryptocurrency and finance, but I'm not entirely clear on its specific purpose and how it operates within the industry. Is it a tool for trading, a platform for development, or something else entirely? I'd appreciate it if you could provide a concise yet informative explanation of what the DFX function entails and how it can be utilized in the world of cryptocurrency and finance.