Android (operating system) store, and by September 2013, one billion Android devices have been activated. , the Google Play store has over 2.7 million Android applications published, and , apps have been downloaded more than 65 billion times. The operating system's success has made it a target for patent litigation as part of the so-called "smartphone wars" between technology companies. Android devices account for more than half of smartphone sales in most markets, including the US, while "only in Japan was Apple on top" (September–November 2013 numbers). At the end of 2013, over 1.5 billion Android smartphones have been sold in the four
Market share of each decision on the market share of their competitors. It is generally necessary to commission market research (generally desk/secondary research) to determine. Sometimes, though, one can use primary research to estimate the total market size and a company's market share. "Market share: "The percentage of a market accounted for by a specific entity."" "Unit market share: "The units sold by a particular company as a percentage of total market sales, measured in the same units."" "This formula, of course, can be rearranged to derive either unit sales or total market unit sales from the other two variables, as illustrated