That's correct! An exothermic reaction releases heat into the surroundings, making the surroundings warmer.

Here's a simple way to remember it:

* Exo means "out" or "external."

* Thermic refers to heat.

So, an exothermic reaction releases heat out of the system.

Examples of exothermic reactions include:

* Burning fuel

* Explosions

* Neutralization reactions (like mixing an acid and a base)

* The formation of rust (iron oxide)

Let me know if you have any other questions!