I have recently taken up homebrewing as a hobby. I make small batches of beer for personal enjoyment, not for sale. 
Oh interesting. What ingredients does homebrewing use?
It's brewed with water, grains, and hops. Hops is important to add flavor and also act as a preservative. 
Interesting! How long does it take typically to make one batch?
Brewing
Brewing is the production of beer by steeping a starch source (commonly cereal grains, the most popular of which is barley) in water and fermenting the resulting sweet liquid with yeast. It may be done in a brewery by a commercial brewer, at home by a homebrewer, or by a variety of traditional methods such as communally by the indigenous peoples in Brazil when making cauim. Brewing has taken place since around the 6th millennium BC, and archaeological evidence suggests that emerging civilizations including ancient Egypt and Mesopotamia brewed beer
additional grains help add different character to the beer so that a single extract can be used to brew several varieties of beer. A full boil is required, with hop additions at different times depending on style.
Homebrewing kits Pre-hopped malt extract.
Sometimes known as beer in a can, no-boil, and hopped wort, these beer kits contain liquid malt extract that has already been boiled with hops to introduce bitterness and flavor. Pre-hopped kits simplify the brewing process by removing the need to add hops