A whois is an Internet database containing information about domain names, including name servers associated with domain names, domain registrars, registrars, and administrative and technical contacts of the domain.
By performing a WHOIS lookup, you can find out when and by whom a domain was registered, their contact information, where the website is hosted, when the domain expires, and much more.
Whois is also a tool that looks for domain name information contained in the WHOIS database. Usually used to check the availability or ownership of a domain name.
Please check domain name availability and check whois here