A blaster, or flamethrower, is a tool that makes fire come out of it in a very controlled and powerful way. It's kind of like having a giant, scary water gun, but instead of water, it shoots out fire!
The way a blaster works is there is a canister like a tank or backpack that holds fuel, such as gasoline, propane or some other flammable liquid. This fuel is directed through a long tube, usually made of metal, to the nozzle at the end of the blaster that has a flame igniter attached to it.
When you pull the trigger on a blaster, it opens up a valve that allows the fuel to come out of the nozzle, and then lights a flame on it. With the help of high pressure and a steady stream of fuel, the flame can reach far away and burn things that are in its way. That's why it's very important to use a blaster safely, and with the proper precautions to make sure no one gets hurt.
Blaster-operators usually wear protective clothing and keep a safe distance away from the flames. They also use these tools for a specific purpose, such as clearing away debris or brush, destroying vehicles, attacking enemy fortifications or performing a controlled burn for forest management.
In short, a blaster is a tool that makes fire spew out of it in a controlled and powerful way by burning flammable fuel.