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Using other than a wired connection to transfer signals or power. Includes optical and (ultra)sound, but most often refers to RF (Radio Frequency). Distances can be as low as centimeters (e.g. RFID); there's no upper limit.
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Choosing a RJ45 to WIFI adapater for use with Embedded Server
Your "RJ45 to wifi adapter" could be just cheap WiFi access point.
If you want WiFi only then ESP8266 modules are very popular recently thanks to their price. They can be used as sort of AT-based mod …