Foreigners willing to enter a country need authorization to do so. Residents of a political and economic union are part of a borderless society or visa free zone that allows access to other member states. For others not part of such societies, authorization may be granted prior to traveling or at the border. This authorization is temporary and conditional. Travel visa are common practice. Travel agents or the border and immigration website of the country of preferred visit provide further information.
A travel visa is issued for a purpose. Those seeking a permanent establishment or willing to settle in a different country must follow the local rules for immigration. However, relocating is a big thing. Therefore, traveling to different countries on a travel visa to test the waters is recommended before obtaining a permanent residency.
Not all countries around the world have friendly relationships with each other. Often a travel visa is stamped or stickered into a passport. Having entered sanctioned countries might create challenges in other countries. Multiple passports for traveling purposes might sound like a good idea to circumvent these restrictions but are not always acceptable. Before traveling to exotic destinations, one should ask whether this potentially creates insurmountable difficulties in the future.