The bit is the most fundamental unit of digital information, representing a single binary value of either 0 or 1. Every piece of data stored or transmitted across the internet ultimately consists of bits, from a single text character to high-definition video streams. Eight bits make up one byte, which is why data storage is typically discussed in bytes rather than bits.

The megabit (Mbit) equals 1,000 kilobits or one million bits, most commonly seen in internet speed ratings where ISPs advertise plans in megabits per second (Mbps). It is important to distinguish megabits from megabytes, since a 100 Mbps connection delivers roughly 12.5 megabytes per second of actual download speed. This unit is essential for comparing and understanding network performance.