Hot spots are a way to access Wi-Fi internet signals in your favorite places (ex. coffee shops, airports, remote work locations). These locations are growing more and more popular everyday. Open puplic networks allow a private user of a router to turn off thier authentication under the router settings, allowing everyone in range to access the available Wi-Fi signal in that location. You can also use a Hot Spot Managment System to allow specific users to access the internet; this is called a closed public network. The above mentioned hot spots tend to be free of charge, to the allowed users in range.
There are also commercial hot spots that allow users in range to access the available Wi-Fi signal for a fee. A captive portal is a login screen that directs the user to a page for authentication or for a payment to use the signal. These locations can also provide a walled garden that allows users to access certain web sites. Under the commercial hot spot umbrrella there is also roaming services available. Roaming allows users of a commercial ISP to have access to other providers Wi-Fi areas for a fee (usually for a minute by minute fee).
Information from www.wikipedia.com
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