A bartender (also known as a barkeep , barman , barmaid , bar chef , tapster , mixologist , alcohol server , flairman or an alcohol chef ) is a person who formulates and serves alcoholic or soft drink beverages behind the bar, usually in a licensed establishment. Bartenders also usually maintain the supplies and inventory for the bar. A bartender can generally mix classic cocktails such as a Cosmopolitan, Manhattan, Old Fashioned, and Mojito. The bartending profession was generally a second occupation, used as transitional work for students to gain customer experience or to save money for university fees.  This however is changing around the world and bartending has become a profession by choice rather than necessity. Cocktail competitions such as World Class and Bacardi Legacy have recognised talented bartenders in the past decade and these bartenders, and others, spread the love of cocktails and hospitality throughout the world. 
Bartenders are also usually responsible for confirming that customers meet the legal drinking age requirements before serving them alcoholic beverages. In certain countries, such as the United Kingdom and Sweden, bartenders are legally required to refuse more alcohol to drunk customers. 
In the United Kingdom, Bar work is often not regarded as a long-term profession (except if you are also a landlord), but more often as a second occupation, or transitional work for students to gain customer experience or to save money for university fees. As such, it lacks traditional employment protections and therefore has a high turnover. The high turnover of staff due to low wages and poor employee benefits results in a shortage of skilled bartenders. Whereas a career bartender would know drink recipes, serving techniques, alcohol contents, correct gas mixes, licensing law and would often have cordial relations with regular customers, short-term staff may lack these skills. Some pubs prefer experienced staff, although pub chains tend to accept inexperienced staff and provide training.
Tipping bartenders in the United Kingdom is not considered mandatory but is greatly appreciated by the bartender. The appropriate way to tip a bartender in the UK is to say 'have one for yourself', encouraging the bartender to buy themselves a drink with one's money, where a bartender may instead opt to add a modest amount to a bill to take in cash at the end of their shift.
The Bureau of Labor Statistics data on occupations in the United States, including that of bartender, publishes a detailed description of the bartender's typical duties  and employment and earning statistics by those so employed, with 55% of a bartender's take-home pay coming in the form of tips.   Bartenders may attend special schools or learn while on the job.
Bartenders in the United States may work in a large variety of bars. These include hotel bars, restaurant bars, sports bars, gay bars, piano bars, and dive bars.   Also growing in popularity is the portable bar, which can be moved to different venues and special events.