BlackBerry Limited is a Canadian multinational company specialising in enterprise software and the Internet of things. Originally known as Research In Motion (RIM), it is best known to the general public as the former developer of the BlackBerry brand of smartphones, and tablets. It transitioned to an enterprise software and services company under CEO John S. Chen. Its products are used worldwide by various businesses, car makers, and government agencies. They include the Blackberry AtHoc emergency communication system (ECS) platform; the QNX real-time operating system; and BlackBerry Enterprise Server (BlackBerry Unified Endpoint Manager), a Unified Endpoint Management (UEM) platform.