Here's why:

* Abundant: Humans have millions of sweat glands distributed across their skin.

* Two main types: Eccrine sweat glands are found all over the body and produce a watery sweat for thermoregulation. Apocrine sweat glands are located in specific areas like the armpits and groin and produce a thicker, odoriferous secretion.

* Essential function: Sweat glands play a crucial role in regulating body temperature, excreting waste products, and contributing to skin hydration.

While other exocrine glands like salivary glands, sebaceous glands, and digestive glands are important, they are not as numerous as sweat glands.