Travel documents are essential papers that allow individuals to travel from one place to another, especially across borders. The most common travel document is a passport, which serves as proof of identity and nationality. Other important documents include visas, which grant permission to enter a specific country, and boarding passes, which are required to board an airplane. In addition to these, travelers may also need travel insurance documents to protect against unexpected events, such as trip cancellations or medical emergencies. It's crucial to keep all travel documents organized and accessible to ensure a smooth journey and avoid any complications during travel.