Kosher salt is a special type of coarse salt that’s extremely popular with chefs and many cooks because it dissolves quickly and its texture makes it easier to reach in and grab a quantity with the fingers. The crystals are light, flat, large, and flaky, which helps it stick to food well. Because these flakes occupy a larger volume than regular salt, it is less dense and you actually end up using less salt as you season and cook, which reduces the risk of oversalting a dish.
This is my second top choice of cooking salt for two reasons: The quality of kosher salt varies dramatically by brand (Morton and Diamond Crystal are the two popular brands in North America), and it’s not readily available across the globe, so I prefer to use fine sea salt when I develop my recipes.