Wireless connectivity refers to the ability of a device or system to communicate and exchange data without using any physical connections such as cables, wires or other hardware. This is achieved through the use of wireless technologies like Wi-Fi, Bluetooth, cellular networks, etc., which allow devices to establish a connection and transfer information over the air. Wireless connectivity has become increasingly popular due to its convenience and flexibility, allowing users to access internet or communicate with other devices without being restricted by physical limitations of cables or wires.