it is a mixture where the components that make up the mixture are uniformly distributed throughout the mixture. The composition of the mixture is the same throughout. There is only one phase of matter.
A homogeneous mixture cannot be separated.
It is a mixture where the components of the mixture are not uniform or not localized regions with different properties. Different samples from the mixture are not identical to each other.
Cereal in milk
Bowl of colored candies
A heterogeneous mixture can be separated.
Note that Heterogeneous and Homogeneous is spelled with an E after the letter N.