A WHOIS lookup is a process that involves using a computer program to retrieve information about the owner of a particular domain name. WHOIS is a database that stores information about domain names and the individuals or organizations that have registered them. This information typically includes the name, address, and contact information of the domain name owner, as well as the date the domain name was registered and when it is set to expire. To perform a WHOIS lookup, you would typically use a tool that is specifically designed for this purpose, such as a website or software program. The tool would take a domain name as input and then return the information that is stored in the WHOIS database for that domain name. This information can be useful for a variety of purposes, such as verifying the ownership of a domain name, identifying the contact information for the owner of a website, or checking the availability of a domain name.