A hotspot is a physical location where people may obtain Internet access , typically using Wi-Fi technology, via a wireless local area network (WLAN) using a router connected to an internet service provider.
Public hotspots may be created by a business for use by customers, such as coffee shops or hotels. Public hotspots are typically created from wireless access points configured to provide Internet access, controlled to some degree by the venue. In its simplest form, venues that have broadband Internet access can create public wireless access by configuring an access point (AP), in conjunction with a router and connecting the AP to the Internet connection. A single wireless router combining these functions may suffice. 
Private hotspots may be configured on a smartphone or tablet with a mobile network data plan to allow Internet access to other devices via Bluetooth pairing or if both the hotspot device and the device/s accessing it are connected to the same Wi-Fi network.
The public can use a laptop or other suitable portable device to access the wireless connection (usually Wi-Fi ) provided. Of the estimated 150 million laptops, 14 million PDAs , and other emerging Wi-Fi devices sold per year for the last few years, most include the Wi-Fi feature.
The iPass 2014 interactive map, that shows data provided by the analysts Maravedis Rethink, shows that in December 2014 there are 46,000,000 hotspots worldwide and more than 22,000,000 roamable hotspots. More than 10,900 hotspots are on trains, planes and airports (Wi-Fi in motion) and more than 8,500,000 are "branded" hotspots (retail, cafés, hotels). The region with the largest number of public hotspots is Europe, followed by North America and Asia. 
Windows: If you need to share your computer s internet connection with the wi-fi only devices in your house—say, if you don t have a wi-fi router—Virtual Router Plus will turn your computer into a wi-fi hotspot.
We ve showed you how to do this with Windows 7 before , but the option seems to be missing in Windows 8. The feature is still there—you just need to do a bit of command line work to start it up—but Virtual Router Plus is a simple, free download that makes it easy. Just download the program, start it up (no installation required), and choose the network you want to share. Give your wi-fi network a name and a password, and start it up! You should be able to connect to that wireless network from your other devices with no problem.
Everybody's got a wireless network at home, but if you've ever wanted to get your iPod…
Windows: Previously mentioned Virtual Router is the easiest way to create a Wi-Fi hotspot on Windows, but 7Tutorials showcases a method that requires no extra tools—just the Command Prompt.
Windows: If you need to share your computer's internet connection with the wi-fi only devices…
If you find yourself with a modem but no router, you can share one computer’s connection to other devices with a few commands. You’ll need to ensure that your computer has a wired and wireless network connection, or a data and Wi-Fi connection. The wireless connection can be shared and used by other computers, tablets and phones.
netsh wlan set hostednetwork mode=allow ssid=MarkWilson key=Lifehacker
You should now be able to connect other devices to the network you created and enjoy a shared internet connection.
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