I use kosher salt in many recipes.
Kosher salt is a variety of edible salt with a much larger grain size than ordinary table salt. Kosher salt is easier to pick up in your fingers and evenly distribute over food. I use it in everything except baking. I use regular table salt in baking because it dissolves quicker and is usually mixed in throughly with other ingredients, so even distribution is not an issue.
A cup of regular table salt has approximately twice the salting power of a cup of kosher salt.
If the recipe calls for kosher salt and you only have regular salt, cut the measurement in half.