A hub is a basic networking device that connects multiple devices in a network and transmits data to all connected devices, regardless of the intended recipient.

Elaboration:

• Operates at Layer 1 (Physical Layer) of the OSI Model.
• Does not filter traffic, leading to collisions and network congestion.
• Less efficient than switches since it lacks MAC address-based forwarding.

Example:

An old Ethernet hub in a small office setup where all devices receive the same data simultaneously.