Kashrut
Among the numerous laws that form "kashrut" are prohibitions on the consumption of certain animals (such as pork and shellfish), mixtures of meat and milk, and the commandment to slaughter mammals and birds according to a process known as "shechita". There are also laws regarding agricultural produce that might impact the suitability of food for consumption.
Kosher restaurant
A kosher restaurant serves food that complies with Jewish dietary laws ("kashrut"). The establishments operate under rabbinical supervision, which requires that the laws of kashrut, as well as certain other Jewish laws, must be observed. Among those laws, the meat and dairy can't be mixed, and grape products made by non-Jews can't be consumed. Pork and shellfish can not be served, and animals must be slaughtered by a certified "shochet," who is frequently a rabbi. In most cases, the location is limited to serving exclusively either dairy or meat foods. But some types of establishments, such as delicatessens, frequently serve both, kept in separate areas.