Wi-Fi is a type of short-area wireless networking. It is commonly used in homes and offices to create a network that can be accessed by computers, smartphones, game consoles, home theater devices, and other gadgets. This allows these devices to access the Internet without needing a wired connection.
Wi-Fi is also used in public hotspots, which is an Internet access point made available in a public location.
Not all smartphones support Wi-Fi, but it is available on many models. Accessing the Internet on a smartphone via Wi-Fi can have several advantages. It typically offers a faster connection than many cellular networks (though some 3G networks will offer speedier connections).
You can use a Wi-Fi connection to send and receive e-mail and surf the Web, often without using the available minutes on your smartphone's data plan. You should read the fine print of your contract to confirm this, but it can potentially save you money, especially if you don't have an unlimited data plan.