The phenotype of an organism is its observable characteristics, such as physical appearance and behavior, which are determined by both its genotype (the genetic makeup of the organism) and the environment in which it develops.
The genotype of an organism is its complete set of genetic information, including all of its inherited genes. The genotype determines the potential range of an organism's traits, but the environment can influence which traits are actually expressed.
So, the genotype is the blueprint of an organism, and the phenotype is the physical manifestation of that blueprint, influenced by the environment.