In computer networking, hubs are hardware devices in the physical layer that function to receive electrical signals on one port, amplify/regenerate those signals, and broadcast them to every other port on the hub.
These are contrasted with switches. Hubs don’t examine MAC addresses or make any forwarding decisions. Additionally, all devices connected to a hub share the same collision domain, i.e., only one device can transmit at a time. This is handled with CD.
So when a device sends a frame through a hub, every connected device will process the frame and check if it’s the intended recipient.
