Tasmota is the firmware, and Tasmotizer loads Tasmota code onto your ESP.
The benefit of using Tasmotizer is that it has a lot of options to make life easier, for example, you can backup the existing firmware from your ESP as a backup before writing the new (if you want to), you can erase the ESP before writing the new (which does have benefits), and most importantly you can also write the configuration to the ESP including wifi name/password & mqtt topic/host details/password etc. direct from Tasmotizer.
So the ESP will be almost fully set up straight away.
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