What protocol is commonly used for wireless communication?

The correct choice highlights Wi-Fi as the primary protocol used for wireless communication. Wi-Fi, which stands for Wireless Fidelity, enables devices to connect to a local area network (LAN) without the need for physical cables. This technology utilizes radio waves to transmit data between devices, making it essential for connecting laptops, smartphones, smart home devices, and more to the internet or to each other wirelessly.

In contrast, other options serve different functions within networking and communication. TCP/IP is a suite of communication protocols used for interconnecting network devices on the internet and is primarily used for wired connections rather than specific wireless connections. HTTP is a protocol used for transferring hypertext requests and information on the web, functioning over TCP/IP but not directly tied to wireless technology. FTP also relies on TCP/IP and is used specifically for transferring files between computers over a network. These protocols have their own specific contexts and applications, whereas Wi-Fi directly addresses wireless connectivity.