Explain and define what homogeneous mixture and heterogeneous mixture mean. What is similar and different between them?

Homogenous mixtures are mixtures which could be described as "smooth" in plain terms. One cannot see what a homogenous mixture has in itself. A homogenous mixture is for example water because you cannot see any parts of what is in a glass of water (H2O, metals, dust particles, etc.)

Heterogenous mixtures are mixtures whose materials can be seen. Such a mixture would be if you put some dirt from the ground into a glass of water. It would be a mixture but unlike homogenous mixtures, you could see what the mixture consists of, water and dirt.