"Broadband" refers to a type of communication channel or technology that can transmit multiple signals simultaneously over a wide range of frequencies. This contrasts with "baseband" transmission, where only a single signal is transmitted over the entire bandwidth.

In practical terms, broadband typically refers to high-speed internet access that provides significantly faster data transmission rates compared to traditional dial-up connections. Broadband connections can be delivered through various technologies, including:

1. **Digital Subscriber Line (DSL)**: DSL uses existing telephone lines to deliver high-speed internet access. It allows for simultaneous voice and data transmission over the same line.

2. **Cable Modem**: Cable internet service is delivered through the same coaxial cables that are used to provide cable television service. It offers high-speed internet access by using the available bandwidth on the cable network.

3. **Fiber Optic**: Fiber optic internet service delivers data via light signals transmitted through optical fibers. Fiber-optic cables offer very high-speed internet access and are capable of transmitting large amounts of data over long distances.

4. **Wireless Broadband**: Wireless broadband technologies, such as Wi-Fi, WiMAX, and 4G/5G cellular networks, provide high-speed internet access without the need for physical cables. These technologies use radio waves to transmit data over the airwaves.

Broadband connections allow users to access a wide range of online services, including streaming video, online gaming, video conferencing, and cloud computing, with greater speed and reliability compared to dial-up connections.