DNS, or Domain Name System, serves as the internet's directory, translating human-readable domain names into numerical IP addresses that computers use to identify each other. It functions like a phonebook for the internet, allowing users to access websites and other online services by typing in familiar domain names instead of lengthy numerical IP addresses. DNS operates through a hierarchical structure, with a network of servers globally distributed to efficiently handle the translation requests. When a user enters a domain name in their browser, their device queries a DNS resolver, which then communicates with various DNS servers to retrieve the corresponding IP address. DNS plays a critical role in internet navigation, enabling seamless and efficient communication between devices across the globe.