DNS is the system that converts human-readable domain names into the IP addresses computers need to find websites and online services. When you type a web address into your browser, a DNS server looks up that address and returns the numerical IP address of the server hosting that site.
Without DNS, you would have to remember and type long strings of numbers (like 142.251.32.46) instead of simple names. DNS acts as a phonebook for the internet, making it far easier to navigate.
Every device connected to the internet uses a DNS resolver, which is usually provided by your internet service provider (ISP) or a third-party service. Some popular alternatives include Google DNS and Cloudflare DNS. Your choice of DNS resolver can affect browsing speed, privacy, and access to certain content.
Real-world example: When you visit bbc.co.uk, your device queries a DNS server asking where that domain is located. The DNS server responds with the correct IP address, allowing your browser to connect and load the page.
What to look for when buying: Most home broadband connections use your ISP's DNS by default. If you value privacy or want faster browsing, you can change to an alternative DNS service. Some routers let you configure DNS settings directly, and most devices allow manual DNS entry in network settings.