Craft beer is one of the fastest growing segments of the alcoholic beverage industry. What started as a niche market, has grown rapidly over the last two decades. The craft beverage industry is divided into four market segments: microbreweries, brewpubs, contract brewing companies and regional craft breweries. How much is this industry growing? Will Anheuser-Busch, Miller and Coors brewing companies have to change their marketing strategy in order to combat the rising demand for craft beer? Here's a look at what you should know about America's craft beer industry.