Border control refers to measures taken by a state or a bloc of states to monitor and regulate the movement of people, animals, and goods across its borders, including land borders as well as airports and sea ports. In some cases, it can also refer to such controls imposed on internal borders within a single state. Border controls in the 21st century are tightly intertwined with intricate systems of travel documents, visas, and increasingly complex policies that vary between countries. While some borders (including most states' internal borders and or international borders within the Schengen Area) are open and completely unguarded, others (including the vast majority of borders between countries as well as some internal borders) are subject to some degree of control and may be crossed legally only at designated checkpoints.
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