A soldering gun is like a tool or a machine that is used to join two things together using a metal alloy called solder.
Imagine you have two pieces of metal, like two wires or two pipes, and you want to connect them together. You can't just glue them together or tie them up, because you need them to conduct electricity or water through them.
That's where the soldering gun comes in. It heats up the solder, making it into a liquid form. You apply the liquid solder to where you want to join the two pieces together, and it cools down and solidifies into a strong bond.
The soldering gun looks like a small gun, with a trigger and a heated metal tip that gets very hot. You need to be careful when using it, because it can burn you or damage other things if it's not used properly.
People use soldering guns for all kinds of things, from fixing electronics and appliances to plumbing and crafting. It's a handy tool to have around if you need to make things stick together in a strong and permanent way.