Those mixtures in which the substances are completely mixed together and are indistinguishable from one another are called homogeneous mixtures.
All the homogeneous mixture is also called a solution.
A homogeneous mixture has a uniform composition throughout its mass.
Examples
A mixture of sugar in water is called a sugar solution and it is a homogeneous mixture because all the parts of the sugar solution have the same sugar-water composition and appear to be equally sweet.
A mixture of alcohol and water is also an example of a homogeneous mixture.
Unpolluted air is a homogeneous mixture of gases like Oxygen, Nitrogen, Argon, Carbon dioxide, and water vapor, etc.