Okay kiddo, sometimes the grown-ups need to keep some information a secret to make sure everybody stays safe. This is where a da-notice comes in handy. A da-notice is like a big "shh, be quiet" sign that the government can put out to tell the news and media people not to share certain information. This could be something like sensitive secrets or important details about a military operation. It's like playing a game of "keep it a secret" to make sure nobody who shouldn't know the information finds out about it. This helps keep everyone safe and makes sure that the grown-ups making important decisions have the best information available to them.