A classification of persons based on physical and biological characteristics is known as racial classification. It categorizes individuals into different groups based on their physical attributes such as skin color, facial features, and hair type. This classification is often used to differentiate people from different ethnic backgrounds. It is important to note that race is a social construct and does not have a biological basis. It is a concept created by society to group individuals based on certain physical characteristics. However, it is important to treat all individuals with equality and respect, recognizing that race is not a determinant of a person's worth or abilities.