What was Fascism during Wrold War 2? (Explaining in the easiest way possible)?

Okay I'm doing a World war 2 ABC booklet project. I've decided to use Fascism for F seeing as it was important. Everytime I look it up I get a thousand words that I don't understand. What was Fascism during World War 2? Please try to explain it in the easiest way possible. As if you're explaining it to an idiot. Like, World War II for dummies (: