DNS, or Domain Name System, is a crucial system used in the internet to translate domain names into IP addresses. This system allows users to access websites and other online resources by typing in a human-readable domain name, rather than a string of numbers. DNS also plays a significant role in directing internet traffic and ensuring that data is transmitted efficiently and accurately across networks. Additionally, DNS can be used for security purposes, such as preventing cyber attacks and monitoring network activity. Overall, DNS is a fundamental component of the internet that is essential for its proper functioning.