Here's a breakdown:

* Viscosity is a measure of a fluid's internal friction.

* High viscosity means the liquid is thick and flows slowly (like honey or syrup).

* Low viscosity means the liquid is thin and flows easily (like water).

Think of it this way: imagine trying to stir different liquids. Syrup would be difficult to stir because it has a high viscosity, while water would be easy to stir because it has a low viscosity.