진피, or "Jinpi," refers to the inner layer of the skin, known as the dermis. This layer is located beneath the outer layer, called the epidermis, and is primarily composed of connective tissue. The dermis contains essential structures such as blood vessels, hair follicles, and sweat glands, playing a crucial role in skin health and function. The dermis is responsible for providing strength and elasticity to the skin, thanks to proteins like collagen and elastin. It also houses nerve endings that help detect sensations such as touch and temperature. Overall, the dermis is vital for maintaining the skin's integrity and overall well-being.