Hotspot

Hotspots are certain places that have Internet service using Wireless LAN technology, such as at universities, plazas, malls, restaurants, libraries or airports. Internet service like this, there are paid and there are provided free of charge. [1]

Hotspot concept was first proposed in 1993 by Bret Stewart and when Networld Interop conference, in San Francisco.

Some components in the hotspot are:
Mobile station
Access Point
Switch, Router, Network Access Controller
Web server or other servers
High-speed Internet connection
Internet Service Provider
Wireless ISPs

There are several commonly used types of hotspot, namely: [3]

Free hotspots as an additional general customers.
Hotspot is paid directly to the landlord.
Paying to wifi hotspot hotspot operators, such as Boingo, iPass. Threat
Today, more and more hotspots are available in many public places, but every time you make a connection at a hotspot is actually endangering your PC or laptop itself. . This condition is possible at all for the hacker to access the hotspot user's credit card, if you conduct transactions online.

Source : www.wikipedia.com