What is the difference between genotype and phenotype?

Everyone has two copies of each gene, one inherited from the mother and one from the father. The combination of both these copies is called the genotype. However the phenotype is what is visibly expressed. For example, you may inherit a blue eyed gene from your father and a brown eyed gene from your mother which would be your genotype. However as the brown eyed gene is dominant, you would have brown eyes. Brown eyes would therefore be your phenotype.