Our skin is the body's largest and most visible organ, acting as a protective shield against the outside world. But beneath its surface lies a complex ecosystem of cells, tissues, and functions that estheticians dedicate themselves to understanding. By delving into the intricate layers, functions, and cell types that make up our skin, estheticians can provide the best possible care for their clients, promoting healthy, radiant skin. **The Skin's Strata: A Journey Inward** Estheticians begin their exploration of the skin by understanding its structure, which can be likened to a meticulously layered cake. Here's a breakdown of the three key layers, venturing from the outermost to the innermost: THE ESTHETICIANS BOOK **The Epidermis: A Fortified Wall** - The epidermis is the skin's outermost layer, our first line of defense. It's a constantly renewing barrier composed primarily of keratinocytes (about 90%), which are constantly producing the protei...