OK kiddo, let me explain what iSCSI is.
Imagine that you have a toy box that has all your toys inside. These toys are like the information that your computer needs to work. Now, what if I told you that your toy box is not in your room, but in your friend's room across the street? How can you play with your toys if they are not close to you?
Well, this is where iSCSI comes in. It's like a magic rope that connects your toy box to your computer, even though they are not close by. This rope is like a network cable that connects your computer to a storage device, like a hard drive, that holds all your information. And the rope is long enough to reach the storage device, even if it's in a different room, building, or even a different country!
When your computer needs information, it sends a message through the iSCSI rope to the storage device, telling it what information it needs. The storage device then sends back the information you asked for, like it is reaching into your toy box and giving you the toy you want.
That's basically what iSCSI is. It's a way for your computer to access information that's stored far away, like your toy box in your friend's room, through a special network cable.