Okay kiddo, so do you know what a messenger bag or a briefcase is? An attaché is kind of like that, but it's a fancy word for a really important type of suitcase that important people use to carry important documents and things with them.
Think of it like a special type of bag that only fancy people and important officials use. It's usually made of fancy materials like leather or metal and has locks or clasps to keep everything inside safe and secure.
So if someone says they have an attaché, it means they have a special briefcase-type thing that they use to carry important stuff around. It's like a super cool way to be organized and keep things safe!