Kosher certification is a process by which a company ensures that their food is kosher, or in other words, fit for consumption by observant Jews. Kosher refers to a religious dietary practice that is rooted in Jewish tradition.
The Kosher Certificate is a document issued by certification agencies and the Chief Rabbinate of Israel, in which a Rabbi certifies that the products referred (usually food) fulfil the biblical precepts of the Jewish religion.
This document in not only required for Israel but also for other countries in which there are Jewish communities calling for kosher products, such as the USA, United Kingdom, France, Russia, Argentina or Mexico.
Kosher Certificates are requested especially for food: meat (slaughter of animals and salting process), fish, milk and eggs, canned and preserved foods. They also include feed additives (preservatives and dyes) and fibre of animal origin.
Products that are kosher certified are often marked with a kosher symbol, or simply the letter K (as the letter M is used to identify Halal products for Muslim population).
There are several institutions and organizations around the world providing Kosher Certification Services.