To understand regionalism, we need to know various dimensions of the region. Region as a geographical unit, is delimited form each other. Region as a social system, reflects the relation between different human beings and groups. Regions are an organised cooperation in cultural, economic, political or military fields. Region acts as a subject with distinct identity, language, culture and tradition.
Regionalism is an ideology and political movement that seeks to advance the causes of regions. As a process it plays role within the nation as well as outside the nation i.e. at international level. Both types of regionalism have different meaning and have positive as well as negative impact on society, polity, diplomacy, economy, security, culture, development, negotiations, etc.