Well, you can always ask the Year 5s!
Students in Year 5y have been experimenting with Mixtures, Solutions and Suspensions. They have learnt that water is a pure substance, but when you stir in other substances you create a mixture. When the substance, like sugar, dissolves in water, this is called a solution. On the other hand, a substance which does not dissolve, like talcum powder, the mixture becomes a cloudy suspension.