WiFi networks can either be "open", so that anyone can use them, or
"closed", in which case a password is needed. An area blanketed in
wireless access through a device is often called a "wireless hotspot."
Anyone with a device that includes appropriate functionality can connect
to this network while in the hotspot. Through this connection, a local
network can be accessed or Internet connectivity can be achieved. This
allows people within the hotspot to connect to the Internet via the
router and modem, often provided for employees at a business or as a
complimentary service at coffee shops and similar locations.
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