Is Corned Beef Kosher?

All beef is kosher. Kashrut does not allow to consume the meat of certain animals, such as pigs or rabbits, snakes, etc. It does give a very precise description of what animals are clean or kosher, and which ones are not. Here it is: kosher animals are ruminants (feeding on grass, chewing it) and they also have to be cloven hoofed. Cows perfectly fall under this description.