Which device is installed in user devices and makes wireless connections between them and a network?

An access point (AP) is a network device that transmits and receives wireless signals, providing a connection point for client devices, but it is not installed in user devices.

A bridge connects two network segments at the data link layer and is not installed in user devices to make wireless connections.

A router connects different networks and forwards data packets between them; it is a central network device, not installed in user devices for wireless connectivity.

A client adapter, also known as a wireless network adapter or Wi-Fi card, is a hardware component installed within user devices (like laptops or smartphones) that allows them to connect wirelessly to a network via an access point.