A Tourist Visa in the UK is a type of visa that allows foreign nationals to enter the UK for a short period of time for tourism, leisure, short-term business needs, or private medical treatments. The UK Standard Visitor visa is the most common type of tourist visa, which allows you to stay in the UK for up to six months. To apply for a tourist visa, you need to complete the online application form, pay the application fee, and provide supporting documents such as a valid passport or travel document, proof of accommodation, travel itinerary, and financial documents to demonstrate your ability to cover the costs of your trip. The specific application process and requirements may vary depending on your nationality and the purpose of your visit. It is recommended to consult official government sources or seek professional advice to ensure you have the most up-to-date and accurate information for your specific situation.