Who can explain to me the differences and specific applications of infrared, Bluetooth, ZigBee and wifi?

The difference between infrared, Bluetooth, ZigBee and wifi;

Infrared ray: it is a point-to-point transmission mode, wireless, not too far away, aiming at the direction, without obstacles in the middle, that is, it is impossible to control the progress of information transmission.

Bluetooth: Also used for short-distance data transmission. Compared with the infrared transmission direction, it can be 360 degrees shorter (the effective distance is within several meters).

Zigbee is a short-distance communication application technology, which has the characteristics of short distance, low complexity, self-organization, low power consumption and low data rate.

Wifi: a technical standard of wireless local area network, a local area network protocol, which cannot be directly compared with NFC and Bluetooth. This is a network technical standard, which is simply used to transmit LAN data, but this is not correct. Let's put it this way.

Application of infrared, bluetooth, ZigBee and wifi;

Infrared: widely used for surface composition analysis and nondestructive testing of polymer products such as rubber, plastic, fiber and adhesive.

Bluetooth: It has applications in mobile phones, headphones, PADs, digital cameras and digital video cameras.

ZigBee: It is mainly suitable for automatic control and remote control, and can be embedded in various devices.

Wifi: network node