IEEE P1619 is a set of standards for protecting information on hard drives and other storage devices. This means it is a set of rules that tell people how to keep things safe on computers.
Imagine you want to hide a toy in a box so that no one else can find it. You might put it in the box, and lock it up with a key. This way, only you will know how to open the box and get the toy out.
In the same way, IEEE P1619 tells people how to protect important information on a computer. It does this by telling the computer how to encrypt the data it stores. Encrypting data is like putting a lock on a box. It makes it so that other people cannot see what's inside unless they have the key to unlock it.
IEEE P1619 is important because it helps keep important information, like bank account numbers or passwords, safe from bad people who want to steal it. Just like we keep our toys safe in boxes, we need to keep our important information safe too.