* Suspensions are mixtures where particles are large enough to be seen with the naked eye and will settle out over time.

* Colloids have particles that are smaller and don't settle out easily.

Think about dirty water:

* Particles: The dirt, sand, and other debris in dirty water are visible and large.

* Settling: If you leave dirty water undisturbed, the heavier particles will sink to the bottom.

Therefore, dirty water is a suspension because the particles are large enough to be seen and settle out.