How had the use of computers expanded by the mid-1950s? what company dominated the computer market in these years?

International Business Machines abbreviated IBM and nicknamed "Big Blue", is a multinational computer technology and IT consulting corporation headquartered in Armork, New York, United States. The company is one of the few information technology companies with a continuous history dating back to the 19th century. IBM manufactures and sells computer hardware and software (with a focus on the latter), and offers infrastructure services, hosting services, and consulting services in areas ranging from mainframe computers to nanotechnologu. Ginni Rometty  is the president and CEO of IBM.