The Samsung Galaxy S (launched in 2010) was one of the first smartphones to include this feature, and starting Android 4.0 Ice Cream Sandwich, all Android smartphones have this feature included natively. Wi-Fi Direct is widely supported by a large pool of devices – most notably smartphones, tablets, laptops, digital cameras, and TVs. The newest generation of Wi-Fi Direct is also NFC compatible. In addition, you can use Wi-Fi Direct in combination with Miracast to screencast onto another device with a display. Thanks to Wi-Fi Direct, you can build up a wireless network between multiple devices. Wi-Fi Direct can be seen as a sort of second-generation Wi-Fi, as it allows compatible devices which do not have their own internet connection, to establish a mutual connection with ones that do (Hotspots, modems, or routers). The reason for it being termed as Wi-Fi Direct is because it uses the same security protocols as our normal Wi-Fi connections do (WPS and WPA/WPA2). Unlike 'normal' Wi-Fi, which requires several devices to connect to a centralized device (like a router), Wi-Fi Direct lets users directly connect one device to another (hence the term Direct). The simplest way to explain what Wi-Fi Direct is to tell you that it is a form of direct, device-to-device communication.
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