WiMax technology Does WiMax technology is used by an ISP for providing cellular internet services? Are WiMax technology different from cellular technology for providing internet? Please mention the difference if there are any. If they are different then what technology used by ISP ?

WiMax is used for WAN access by some ISPs. It's not used for cellular services, only for cellular backhaul.

WiMax is somewhat similar to Wi-Fi but has carrier features and much longer reach. It's completely different from traditional cellular services, the differences would most likely fill a book.

For a start, you can find overviews here

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and primers and standards here

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What technology an ISP uses is entirely up to them. Technologies like WiMax and WLL are in some use, Wi-Fi is also used for short range and hotspot coverage.