How does Coinomi work?

Could you please explain to me in simple terms, how does the Coinomi cryptocurrency wallet function? I'm particularly interested in understanding the technicalities behind its operation, such as how it securely stores my private keys and ensures the safety of my digital assets. Additionally, I'd like to know if it supports multiple cryptocurrencies and if there are any notable features that set it apart from other wallets in the market. Lastly, what kind of user experience can I expect when using Coinomi?