Converter -- Common RV appliance, changes 120VAC shore power to 12VDC to power 12V
lights and stuf and recharge battery.
Inverter -- Less common appliance, changes 12VDC to 120VAC, usually to power small stuf like laptops, cell phones,
lights, fans, etc., although can be found in larger sizes.
Generator -- Has gas, diesel or LP-powered engine to produce 120VAC power and sometimes small amount of 12VDC power.