Being in the EU and/or Schengen shapes visa-free travel, residency portability, and which rules apply to you as a newcomer.
EU membership gives citizens of other EU states freedom of movement; Schengen membership removes border checks between member states for short stays. The two sets overlap but aren't identical (Ireland is EU-but-not-Schengen; Switzerland, Iceland, Norway are Schengen-but-not-EU).
Methodology on the methodology page. Each row links to the country brief with full source attribution.
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