The main use of Namecoin is to buy and renew domain names, bit. This DNS is decentralized, it is resistant to censorship and cannot be closed. This is a valuable option for websites that carry out activities that their governments might want to restrict.
Being one of the first projects after Bitcoin, its objective is not to decentralize the financial system, but to decentralize the Internet domain name system (DNS), where its operating characteristics are similar to that of Bitcoin.