Hi there! So, do you know what distillation is? It's when you heat something up (like water) and turn it into gas or steam, and then you collect it back as a liquid by cooling it down again. It's a way to separate different things that are mixed together.
Vacuum distillation is just like distillation, but instead of heating things up normally, you heat it up in a special machine that takes away all the air and makes it very, very low pressure. When you do this, it takes less heat to make things turn into gas or steam. This helps you distill things that would normally need very high heat, like crude oil or some kinds of chemicals.
Think of it like boiling water on a high mountain. You know how it's hard to boil water up there because the air pressure is low? It's the same idea with vacuum distillation - taking away air pressure makes things boil and turn into gas much easier. This helps scientists and engineers make things like medicine or oil that we use every day!