The DNS system that your computer uses every time to make a search is a fundamental system that you can’t just do away with. You see, computers don’t understand what we mean when we type in ‘YouTube’ into the search box. Computers understand numbers so there needs to be a service that converts the friendly words we type into the numbers that computers understand. Enter DNS - Domain Name System. PCMag investigates what happens when you use this service and what you can do to improve your internet speed simply by changing your DNS settings. You can also make your search safer and more secure.
https://www.pcmag.com/review/364418/how-and-why-to-change-your-dns-server