Drafting tape is like a sticky paper that people use when they draw or make art. It helps them keep their paper in place so it doesn't move around while they are working.
Imagine you are coloring in a picture with your crayons, but the paper keeps moving around and doesn't stay in one spot. That would make it really hard to color and might make the picture look all messy. Drafting tape is like a helper that makes sure the paper stays still so you can color in peace.
People who make art or draw things for work really like using drafting tape because it doesn't damage the paper or leave a sticky mess when you take it off. Kind of like a band-aid for your picture!