Wifi module has two networking modes: STA and AP. STA and AP can provide flexible networking modes and network topology methods.

AP: wireless access point is the center of a wireless network node. Generally, wireless router is an AP, other wireless terminal can be interconnected through AP.

STA: wireless site is a wireless network terminal such as PC and PDA.

WIFI module works as STA
WIFI module as STA is one of the most common network mode, and it is composed of a router AP and many STA. In the following figure, AP is in a central position, and communication between STAs is forwarded by AP.

WIFI module works as AP
When WIFI modules works as AP, phone/PAD/PC can fast access to wifi module for data transmission without any configuration. In addition, you can log in internal webpage of wifi module to set parameters.