Are sherry and cooking sherry different?

"Cooking sherry" is sherry of inferior quality with salt added to make it unpalatable for drinking. It was developed during a time when servants did most of the cooking, in order to prevent them from consuming the sherry kept in the kitchen. Because it made to be unpalatable for drinking it is also unpalatable in recipes.

Cooking sherry is seldom used today, and never by serious cooks. Recipes calling for sherry should be made with a sherry produced for drinking. The type and quality used should be determined by the recipe, sweetness level desired, and cost.