Lager is one of the two main types of beer currently sold on the market. Lager is distinguished by the type of yeast used in brewing: bottom-fermenting as opposed to the top-fermenting yeast used for brewing ales. Lager is typically brewed for longer periods of time and at cooler temperatures than ale. They are best served at cold temperatures and pair well with a wide variety of foods.
Some of most popular beers on the commercial market are pale lagers; it is the most frequently consumed type of beer worldwide these days. Pilsner and helles are other varieties of light lager that are quite popular. Dark lagers also exist and are notable for having a more complex flavor than your typical lager. However, lagers overall generally have a simpler flavor profile, milder hops bitterness, and lower alcohol content than ales, which likely explains their broader appeal.
While many people enjoy beer as a beverage by itself, there are quite a few mixed drink recipes out there where lager is used for a base. While not technically cocktails (those are defined as mixed drinks with a spirit base like rum or vodka), many are still popular drinks at bars around the world. These recipes can involve adding spirits or even other varieties of lager or ale.