A political party that meets the vote-share or seat criteria laid down by the Election Commission and is therefore recognised as either a National Party or a State Party, with consequent privileges.
The National-versus-State recognition criteria and the privileges (reserved symbol, broadcast time) are standard electoral-system facts; verify the latest exact thresholds as the Commission revises them.
All recognised parties are registered, but not all registered parties are recognised; recognition (symbols and privileges) is separate from mere registration under Section 29A of the Representation of the People Act, 1951.
Election Commission recognises parties as National or State under the 1968 Symbols Order, giving a reserved symbol and broadcast time.