Microsoft is an American tech corporation, established back in 1975. It specialises in the development and licensing of multiple software and hardware products. Microsoft's flagship software products are the Microsoft Office Suite and Windows OS. Their hardware line is represented by the Xbox game consoles and Windows phone. Also, the company is engaged in online advertising and cloud services, such as; Bing, OneDrive, Xbox Live, Yammer and among others. Microsoft conducts specialised training for developers and issues certificates, as well as providing full technical and marketing support to a number of brand-own products. The company constitutes the NASDAQ-100, DJIA, S&P 500, and the S&P 100 indices. Microsoft is listed on the NASDAQ stock exchange.