Okay kiddo, so you know how sometimes you want to use the computer but you're not at home? Maybe you're at school, or at a friend's house or even on vacation with your family. But you still need to use the computer because you have important things to do.
That's where the Cisco Systems VPN Client comes in. VPN stands for Virtual Private Network, which basically means it's like a secret tunnel that lets you use your home computer from anywhere, like you're still sitting in your bedroom.
It's like a secret code that you have to put in to connect to your home computer over the internet. You can use the VPN client to do stuff like check your email, do homework or even play video games on your home computer from anywhere.
So you install the Cisco Systems VPN Client on your computer and then you type in the secret code (username and password) to connect to your home computer. Then you can do whatever you need to do on your home computer, even if you're not actually there! Cool, huh?