What is klever exchange?

Could you elaborate on what Klever Exchange is? I've heard about it but I'm not entirely clear on its purpose and functionalities. Is it a decentralized exchange? What kind of cryptocurrencies does it support? What sets it apart from other exchanges in the market? Also, how secure is it for users to trade on this platform? Are there any fees involved? I'd appreciate a concise yet comprehensive overview of Klever Exchange and its offerings.