International Business Machines Corporation (IBM, or colloquially, Big Blue) NYSE: IBM (incorporated June 15, 1911, in operation since 1888) is headquartered in Armonk, NY, USA. The company manufactures and sells computer hardware, software, infrastructure services and consulting services.

With almost 330,000 employees worldwide and revenues of $91 billion annually (figures from 2005), IBM is the largest information technology company in the world, and one of the few with a continuous history dating back to the 19th century. It has engineers and consultants in over 170 countries and development laboratories located all over the world, in all segments of computer science and information technology; some of them are pioneers in areas ranging from mainframe computers to nanotechnology.

In recent years, services and consulting revenues have been larger than those from manufacturing. Samuel J. Palmisano was elected CEO on January 29, 2002 after having led IBM's Global Services, and helping it to become a business with a $100 billion in backlog in 2004.

In 2002 the company strengthened its business advisory capabilities by acquiring the consulting arm of professional services firm PricewaterhouseCoopers. The consulting arm was previously known as Monday. The company is increasingly focused on business solution driven consulting, services and software, with emphasis also on high value chips and hardware technologies; as of 2005 it employs about 195,000 technical professionals. That total includes about 350 Distinguished Engineers and 60 IBM Fellows, its most senior engineers. IBM Research has eight laboratories, all located in the Northern Hemisphere, with five of those locations outside of the United States. IBM employees have won five Nobel Prizes. In the USA, they have earned four Turing Awards, five National Medals of Technology, and five National Medals of Science, and outside the USA, many equivalents.