Coarse sea salt is characterized by its larger, chunky crystals compared to fine sea salt or table salt. It's known for its satisfying crunch and burst of briny flavor, making it a popular choice for finishing dishes or adding texture to baked goods. It's also commonly used in grinders and for brining or pickling. 
Here's a more detailed breakdown:
Appearance:
Coarse sea salt has larger, irregular crystals, often described as chunky or granular. 
Flavor:
It shares the characteristic saline flavor of sea salt but can offer a more pronounced burst of flavor due to the larger crystal size. 
Texture:
The larger crystals provide a satisfying crunch, especially when used as a finishing salt. 
Uses:
Finishing salt: Sprinkled on dishes just before serving for added flavor and texture. 
Grinding: Often used in salt grinders for freshly ground salt. 
Baking: Adds a decorative and textural element to pretzels, crackers, and other baked goods. 
Brining and pickling: The large crystals are ideal for creating brines for pickling and preserving foods. 
Cooking: Can be used in recipes where the saltiness needs to be distributed throughout the dish. 
Production:
Coarse sea salt is often produced by solar evaporation of seawater, resulting in larger crystals. 
Other names:
May also be referred to as grinder salt or mill salt.