Access point is similar to hub or switch in a wired LAN. When IEEE 802.11 systems work through an access point, it is called to be operating in infrastructure mode because access point is coordinating the WiFi LAN from a fixed point and often providing a connection to wired network.
Wireless devices can also transmit directly to any other. It is intended for group of people wanted to share information anywhere anytime on ad hoc basis. This set up is thus called ad-hoc mode.
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