Which layer of the skin acts as a barrier to protect underlying tissue?

The epidermis is the outermost layer of the skin and serves as a crucial barrier protecting the underlying tissues, such as the dermis and subcutaneous layers. Its primary role is to prevent the entry of pathogens, chemicals, and physical irritants, while also minimizing water loss from the body. This layer consists of multiple layers of cells, with the outermost being composed of dead keratinized cells that provide both mechanical strength and waterproofing. Additionally, the epidermis contains melanocytes, which contribute to skin pigmentation and protect against UV radiation. Understanding the function of the epidermis is essential for appreciating how the skin protects the body overall.