Question

distinguish between a regional and a national party​

Answer 1

A "regional party" is any political party with its base in a single region, whatever its objectives and platform may be, whereas "regionalist" parties are a subset of regional parties that specifically campaign for greater autonomy or independence in their region.

A registered party is recognised as a National Party only if it fulfils any one of the following three conditions: ... At a General Election to Lok Sabha or Legislative Assembly, the party polls 6% of votes in four States and in addition it wins 4 Lok Sabha seats from any state or states;

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