These are borders where crossing is unimpeded by physical barriers or immigration controls.
Consider going from one room in your house to another without having any doors blocking your way. That's what open boundaries are like - they allow free movement without any barriers.
Schengen Agreement: An agreement among some European countries that abolished border controls between them.
Free Trade Zone: A region where a group of countries agree to reduce or eliminate trade barriers.
Immigration Policy: Government rules and regulations controlling who can enter a country, for how long, and for what purpose.
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