A DNS is a Domain Name System and it acts as a directory for the internet. For example, you know that this website is www.wizcase.com, but your browser only sees the Internet Protocol (IP) address. When you type a URL into your browser, the DNS translates the URL into an IP address for your browser.
The DNS directory is a global network stored on servers around the world. These servers connect with each other when a DNS request is made (i.e. when you type a URL into the browser and hit “Enter”). By communicating with each other, your DNS request is met with the right data response and you get to access the website you want — and the whole process happens in milliseconds.
If you’re privacy-conscious, I suggest connecting to a no-logs VPN to hide your DNS requests. This ensures your IP address and identity will remain anonymous from the DNS provider.