Definition: A megabit (Mb) is a unit of data storage equal to 1,000,000 bits. It's a multiple of the bit, which is the fundamental unit of information in computing and digital communications.

History/origin: The megabit is based on the bit and uses the SI prefix 'mega' to denote one million. The concept of bits arose with the development of digital computers and information theory in the mid-20th century.

Current use: Megabits are commonly used to measure data transfer rates, such as network speeds or internet connection speeds. For example, internet service providers often advertise speeds in megabits per second (Mbps).