No dumb questions, just dumb mistakes.
Simply put:
Maps: short for fuel maps. Your ecu is set up to run a "map" around certain parameters set up for your bike, your mods. Fuel, air, throttle curves etc. Further expanded on a reflash you can include nitrous timing etc. Edit: your bike is set by the factory and if you have your ecu reflashed, you are changing the fuel map. Also done during a dyno tune via either an ecu editor or power commander, bazzaz, etc.
TRE: short for timing retard eliminator. You can purchase one and plug it in. Basic effect is removing the top speed restrictor that is in the 6th gear fuel map. You are essentially fooling the computer into thinking you are in 5th gear and not 6th. The downside is your bike will run the 5th gear fuel map in all gears. Some say it smooths things out in the lower gears, but that was not my experience.