What exactly is beer?

Beer, generically, is any alcoholic beverage produced through the fermentation of sugar suspended in an aqueous medium, and which is not distilled after fermentation. The unfermented sugar solution, called wort, is obtained from steeping, or "mashing," malted grains, usually barley. Alcoholic beverages made from the fermentation of sugars derived from non-grain sources are generally not called "beer," despite being produced by the same yeast-based biochemical reaction.

As almost any substance containing certain sugars can naturally undergo fermentation, it is likely that beer-like beverages were independently invented among various cultures throughout the world. Chemical tests of ancient pottery jars reveal that beer was (like Wine) produced about 7000 years ago in what is today Iran, and is one of the first known biological engineering tasks, where the biological process of fermentation is used in a process.

Beer was important to early Romans, but during Republican times wine displaced beer as the preferred alcoholic beverage. Beer became a beverage considered fit only for barbarians; Tacitus wrote disparagingly of the beer brewed by the Germanic peoples of his day.

The addition of hops to beer for bittering, preservation, and aroma is a relatively recent innovation: in the Middle Ages many other mixtures of herbs were often employed in beer prior to hops. These mixtures are often referred to as gruit. Hops were cultivated in France as early as the 800s; the oldest surviving written record of the use of hops in beer is in 1067 by well-known writer Abbess Hildegard of Bingen: "If one intends to make beer from oats, it is prepared with hops."

In Europe, beer largely remained a homemaker's activity, made in the home in medieval times. By the 14th and 15th centuries, beermaking was gradually changing from a family-oriented activity to an artisan one, with pubs and monasteries brewing their own beer for mass consumption. In 15th century England, an unhopped beer would have been known as an ale, while the use of hops would make it a beer. Hopped beer was imported to England from the Netherlands as early as 1400 in Winchester, and hops were being planted on the island by 1428. The popularity of hops was at first mixed — the Brewers Company of London went so far as to state "no hops, herbs, or other like thing be put into any ale or liquore wherof ale shall be made — but only liquor (water), malt, and yeast." However, by the 16th century, "ale" had come to refer to any strong beer, and all ales and beers were hopped.

Most beers until relatively recent times were what we now called ales. Lagerswere discovered by accident in the 16th century after beer was stored in cool caverns for long periods; they have since largely outpaced ales in terms of volume.

With the invention of the steam engine in 1765, industrialization of beer became a reality. Further innovations in the brewing process came about with the introduction of the thermometer and hydrometer in the 19th century, which allowed brewmasters to increase efficiency and attenuation. Prior to the late 18th century, malt was primarily dried over fires made from wood, charcoal, or straw, and after 1600, from coke. In general, none of these early malts would have been well shielded from the smoke involved in the kilning process, and consequently, early beers would have had a smoky component to their flavors; evidence indicates that maltsters and brewers constantly tried to minimize the smokiness of the finished beer. The invention of the drum roaster in 1817 by Daniel Wheeler allowed for the creation of very dark, roasted malts, contributing to the flavour of porters and stouts. The discovery of yeast's role in fermentation in 1857 by Louis Pasteur gave brewmasters methods to prevent the souring of beer by undesirable microorganisms.

So what's the difference between Ale and Lager?

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