Remain suspended so dont have to be constantly shaken. i.e. milk. you dont have to mix it each time you use it and ame with mayo.
Suspensions
Settle out so contents can be removed/utilised efficiently. i.e. teabags. You boil water and tea leaves. The tea dissolves in water and the leaves separate to the bottom. The tea (water + dissolved tea) can now be poured out for drinking without the tealeaves having to be drunk
Solutions
Dont need shaking nor settle out. This allows them to be homogenous throughout. errr hmm....Petrol, doesnt need to be mixed in tank.