Muslims around the world practice the religion of Islam. The practice of Islam includes observing dietary laws which come from Islamic teachings. Islamic dietary laws define foods that are Halal, meaning lawful or permitted. Muslims avoid food and beverages that are Haram, meaning not permitted.
Many foods are clearly Halal or clearly Haram. However, certain foods are difficult to classify because of the ingredients they contain. Check for Halal certification or read food labels. Check carefully each time you buy food products, as manufacturers may change ingredients without notice.
For meat and poultry to be Halal, it must be slaughtered according to Islamic dietary laws (Zabihah).

Forbidden to you (for food) are: dead meat, blood, the flesh of swine, and that on which hath been invoked the name of other than Allah. that which hath been killed by strangling, or by a violent blow, or by a headlong fall, or by being gored to death; that which hath been (partly) eaten by a wild animal; unless ye are able to slaughter it (in due form); that which is sacrificed on stone (altars); (forbidden) also is the division (of meat) by raffling with arrows: that is impiety. This day have those who reject faith given up all hope of your religion: yet fear them not but fear Me. This day have I perfected your religion for you, completed My favour upon you, and have chosen for you Islam as your religion. But if any is forced by hunger, with no inclination to transgression, Allah is indeed Oft-forgiving, Most Merciful. [Al-Maeda 5:3]

Halal Food

Halal Food Authority