Okay kiddo, so once upon a time, Italy was going through a very tough time called World War II. The bad guys, or the Germans, were in charge of Italy and were doing some really mean things to the Italian people.
But some brave Italians didn't like that at all, so they formed a group called the Partisans. Kind of like a secret club of cool people who wanted to fight for their country's freedom.
The Partisans didn't have many weapons or fancy gear, so they had to be very sneaky and creative. They would hide in the mountains, sneak around at night, and sometimes even blow up bridges or other important things to make it hard for the bad guys.
They wanted to help their country become free again, so they did a lot of dangerous things to help the good guys, or the Allies, win the war. And even when the war ended, they kept on fighting to make Italy a better place.
So basically, the Italian Partisans were brave people who wanted to make their country a better place by fighting against the bad guys during World War II.