Plasm is kind of like the juice or liquid inside your body that helps your cells do what they need to do to grow and stay healthy. Just like how you need water to survive, cells also need plasm to survive and do their job. Plasm is made up of different things like water, salts, and proteins that keep the cell working properly. It's kind of like a cell's own personal water bottle, but with a lot of other important stuff in it too. Without plasm, a cell wouldn't be able to function and could even die. So, it's very important that cells have enough plasm to keep them healthy and happy!