DNS (Domain Name System) host refers to a computer or server on the internet that is responsible for storing and managing DNS records. These records map human-readable domain names (like www.example.com) to their corresponding IP addresses, enabling the translation between easily memorable domain names and numerical IP addresses that computers use to communicate on the internet. A DNS host plays a crucial role in facilitating the resolution of domain names to IP addresses, helping users access websites and other internet resources using familiar domain names.