Okay kiddo, imagine you have a toy box full of your favorite toys. Every time you want to play with your toys, you have to dig through the box to find the toy you want. This takes a lot of time and makes you frustrated.
Now, imagine you have a special bag that you keep your favorite toys in, and you carry this bag with you wherever you go. When you want to play with a toy, you simply reach into your bag and grab it. This is much faster and more convenient.
A cache on a stick is kind of like your toy bag. It's a small device that you can plug into your computer or other electronic device, and it helps make things load faster. The cache on a stick remembers things that your device needs, like pictures or web pages, so that the next time you visit that website or look for that picture, it loads much faster.
It's kind of like having all your favorite toys in one convenient place, so you don't have to dig through your toy box every time you want to play with something. Instead, you can just reach into your cache on a stick and grab what you need.