What is the principle of rapid propagation of eggplant? Why don't you need traffic to open a wifi hotspot?

Fast eggplant transmission is the principle of free transmission using WIFI network. \x0d\ For Internet terminal devices, except for non-free WIFI provided by operators (such as mobile CMCC), other WIFI can be used for free as long as it can be connected smoothly (devices providing WIFI signals may need to pay an additional network fee). \x0d\WIFI hotspot is to set the mobile phone as a WIFI transmitter by using its own WIFI function, so that other mobile phones can also receive WIFI signals from this mobile phone when WIFI is turned on, and data transmission between them does not need traffic through the mobile phone. \x0d\WIFI hotspot transmission mode is similar to the popular Bluetooth function. Two mobile phones transmit via Bluetooth without running traffic, but the coverage distance and transmission speed of WIFI are much better than Bluetooth.