"Nordic Europe" and "Scandinavia" are often used interchangeably, but they're not identical. The Nordic region comprises five sovereign nations and three autonomous territories bound by historical, cultural, and political ties.
The Baltic states (Estonia, Latvia, Lithuania) are not Nordic countries. They share some historical connections—particularly Estonia's linguistic and cultural links to Finland—but they identify as Baltic, not Nordic. Their 2004 EU/NATO accession aligned them more with Central European frameworks.
Strictly, Scandinavia refers to the peninsula shared by Norway and Sweden, plus Denmark (culturally/historically). Finland and Iceland are Nordic but not Scandinavian. The Nordic Council (1952) formalized cooperation among all eight members.