Corvettes, light frigates, and OPVs

What are the best examples of corvettes, and where do they overlap with frigates?

The main dividing lines are endurance, deployment range, aviation support, and weapon fit; OPVs trade combat power for patrol endurance.

This classification starts with endurance, then considers armament and aviation support. A corvette may concentrate on one combat role and spend relatively little time away from port. The Braunschweig class illustrates the distinction: the discussion gives seven days' endurance, or 21 with a tender, and a helicopter landing pad with hangar space for drones rather than a helicopter. A light frigate can combine corvette-like armament with the ability to remain deployed for months. A larger frigate adds sustained helicopter support and substantial capability against aircraft, ships, and submarines. River Batch 2 patrol vessels illustrate a different tradeoff, emphasizing oceanic patrol endurance over combatant armament.