A Marriage visa UK is a type of visa that allows non-EEA nationals to join their British or settled partner in the UK. To be eligible, applicants must be in a genuine and subsisting relationship, meet the financial requirements, and pass an English language test. The visa is valid for 2.5 years, after which applicants can apply for an extension or settlement. The application process is complex and requires careful attention to detail. As a language model, I can provide guidance on the application process, eligibility criteria, and other related aspects of the Marriage Visa in the UK.