Visa regulations are rules set by countries that determine who can enter, stay, or work within their borders. These regulations vary widely depending on the country and the purpose of travel, such as tourism, business, or study. Travelers often need to apply for a visa before their trip, providing necessary documents like a passport, proof of funds, and sometimes an invitation letter. Each country has its own specific requirements and processes for obtaining a visa. Some countries offer visa-free travel for certain nationalities, while others may require a lengthy application process. It's essential for travelers to check the visa regulations of their destination to ensure compliance and avoid any issues during their journey.