The ".uk" domain is the country code top-level domain (ccTLD) for the United Kingdom. It is used by individuals, businesses, and organizations based in the UK to establish their online presence. The domain is managed by Nominet, which oversees the registration and maintenance of ".uk" domains. There are several second-level domains under ".uk," including ".co.uk" for commercial entities, ".org.uk" for non-profit organizations, and ".ac.uk" for academic institutions. These variations help categorize websites and make it easier for users to identify the nature of the site. The ".uk" domain is widely recognized and trusted by internet users.