Travel restrictions are rules set by governments that limit or control the movement of people across borders. These restrictions can be due to various reasons, such as health concerns, security issues, or political situations. For example, during a pandemic, countries may impose restrictions to prevent the spread of disease, requiring travelers to show proof of vaccination or undergo testing. These rules can vary widely between countries and may change frequently. Travelers should always check the latest information from official sources, such as government websites or the World Health Organization, before planning their trips to ensure compliance with current regulations.