Here's why:

* Keratinocytes are the primary cells of the epidermis, the outermost layer of skin.

* Melanocytes are specialized cells located in the basal layer of the epidermis that produce melanin.

* Melanin is a pigment that gives skin its color and protects it from ultraviolet (UV) radiation.

* Phagocytosis is a process by which cells engulf and digest particles, such as melanin granules.

When melanocytes produce melanin, they transfer it to keratinocytes via a process called cytocrine secretion. The keratinocytes then phagocytize the melanin granules, which are then distributed throughout the cell. This process gives the skin its color and helps to protect it from UV damage.