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It is much easier for you to memorize the domain name of a service (e.g. https://duckduckgo.com) than one of its corresponding IP addresses (e.g. 23.21.193.169). Typing the IP address in the URL bar and submitting would still take you to the site, but doing that for every website you are using is not very convenient. Instead, your computer relies on DNS servers to automatically do the mapping for you. To make requests even faster, it uses caching to store mappings for easier future reference.
Note: In occasions where the query contains a subdomain (e.g. https://developer.mozilla.org), there will be an extra nameserver that gets added to the end of the sequence which is responsible for that subdomain (developer).