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WLAN means any wireless local area network no matter what technology is used and Wi-Fi is a type of WLAN that follows the IEEE 802.11 standards which most WLANs in use today do, that's why they are commonly used interchangeably. Wi-Fi as a name for the standard is a trademark of the Wi-Fi Alliance.
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1. WLAN is a type of computer network in a relatively small area that dismisses the use of physical means of interconnectivity.

2. WI-FI is a trademark name to brand devices compliant to IEEE 802.11 stal

3. Devices in a WLAN essentially use WI-FI branded products.

4. A WI-FI ready device simply means that it is ready for network operation within a WLAN.