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Kosher food is food that meets with the jewish laws.
The word kosher is not only used for food. Kosher basically means that something follows all the Jewish legal guidelines.

the types food:

Fish and meat cannot be served together.
Milk and meat cannot be served together. Rabbinic law includes poultry in this prohibition, however fish is excluded. This gives rise to the popular, and kosher, bagel, lox, and cream cheese combination.
Processed food must be prepared in the presence of a rabbi.
Poultry and meat must be slaughtered under strict guidelines called "shechita." This means the animals are slaughtered without pain.
Only those who are trained and qualified are allowed to slaughter kosher animals.
Once the animal is no longer alive, another team of experts will examine the animal to be sure the animal is without illness, abnormalities or anything else that can be considered unsanitary. The lungs in particular must be pure. In addition, all blood, nerves, and most fat must be removed.