DNS, or Domain Name System, is a system that maps human-readable domain names to the numerical IP addresses that computers use to communicate with each other. This allows users to access websites and other online resources using easy-to-remember domain names, rather than having to remember the complex numerical IP addresses.

Every device that is connected to the internet has a unique IP address, which is a series of numbers that identifies the device on the network. However, these numbers can be difficult for humans to remember, which is where DNS comes in.

DNS works by translating domain names into their corresponding IP addresses. When a user types a domain name into their web browser, the browser sends a request to a DNS server to look up the IP address for that domain name. The DNS server then responds with the correct IP address, and the browser uses that address to connect to the website or online resource associated with the domain name.

DNS servers are distributed across the internet, and they work together to ensure that domain names are properly resolved to the correct IP addresses. This allows users to access websites and other online resources using easy-to-remember domain names, rather than having to remember complex IP addresses.

In conclusion, DNS is a system that allows users to access websites and other online resources using easy-to-remember domain names. It works by translating domain names into their corresponding IP addresses, and it is an essential part of how the internet functions.