How does dYdX margin work?

Could you please explain to me how does dYdX margin operate? I'm interested in understanding the mechanisms behind it. Does it involve leveraging my funds? How does it ensure liquidity and security? Is there a specific process or protocol that needs to be followed? Also, could you elaborate on the risks involved in margin trading on dYdX? I'm keen on understanding both the potential rewards and the potential downsides. Thank you for your assistance in clarifying this topic.