DNS is the central part of the internet that provides a way to match names ( a destination website) to numbers (the address for the website).
The domain name system is the phonebook of the internet to access information online through domain names, for ex: klcweb.com. Web browsers interact through IP (internet protocol) addresses. DNS translates domain names to IP addresses so browsers can load Internet resources.
Each device connected to the internet has a unique IP address that other machines use to find the device. DNS servers eliminate the need for humans to memories IP addresses such as 192.168.1.2 (in ipv4).