Internet speed refers to how quickly data is transmitted over a network. It is usually measured in megabits per second (Mbps) or gigabits per second (Gbps). Higher speeds allow for faster downloads, smoother streaming, and better online gaming experiences. Factors affecting Internet speed include the type of connection (like fiber optic or DSL), network congestion, and the distance from the router. Users can test their Internet speed using various online tools to determine how well their connection performs.