All table salt is kosher - so what, then, is Kosher Salt? Kosher salt is a flake salt that gets its name from its use in preparing meat according to Jewish dietary guidelines. That is, this is salt that can be used in *koshering* meats, as written in the Torah.
Rather than cubic crystals, kosher salt has a flat flake shape. Kosher salt is usually manufactured with a grain size larger than table salt grains. Due to the shape of the crystals, kosher salt flakes occupy more volume than a similar mass of table salt. [You may want to adjust the salt in baking recipes a bit, or measure kosher salt by weight instead of by volume.]
Kosher salt has a saltier, cleaner, and less chemical taste than ordinary table salt. Kosher salt is free of iodine [a common ingredient in regular table salt], which can react badly with some foods.
Kosher salt is the go-to ingredient for making marinades, in canning and pickling recipes. Kosher salt is the salt you typically find on top of soft pretzels and on the rims of margarita glasses. Kosher salt is an inexpensive staple for everyday cooking.