* Genotype: This refers to the genetic makeup of an organism, specifically the combination of alleles (different versions of a gene) an individual carries. Genotypes are encoded within DNA, which is invisible to the naked eye. We can analyze genotypes through genetic testing, but we can't directly see them.

* Phenotype: This refers to the observable characteristics of an organism, which are influenced by both the genotype and environmental factors. These are the physical traits we can see, such as hair color, eye color, height, or even behaviors.

Examples:

* Genotype: You might have the genotype "Bb" for eye color, meaning you carry one dominant allele (B) for brown eyes and one recessive allele (b) for blue eyes.

* Phenotype: You might have brown eyes as a result of this genotype, even though you carry the allele for blue eyes.

In summary: Phenotypes are the physical expression of genotypes, and are the only thing we can directly observe.