In most publications or references market cap is broken down into the mega cap, large cap, mid cap, small cap, micro cap, and nano cap. Market Cap is a measurement of business as total market value of all of outstanding shares at a given time, and can be used to compare different companies based on their size.
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Market Capitalization is total market value of a company's equity. It is one of many ways to value a company and is calculated by multiplying the price of the stock by the number of shares issued. If a firm has one type of stock its market capitalization will be the current market share price multiplied by the number of shares. However, if a company has multiple types of equities then the market cap will be the total of the market caps of the different types of shares.