Beer is a very common spirits drink. Its main ingredients are water, malt (usually barley) and hops, and are produced through the fermentation process. Beer is found in many different variants and species. References for beer brewing start from ancient Egypt and Mesopotamia, about 4000 BC. The beer industry is currently very well developed by including several and economically strong multinational companies. Despite the fact that beer production may show different variations in the technique, modern brewery involves four basic and necessary steps. Malnutrition, boiling, fermentation and transfusion. The two main types of beer are Lager and Ale.