Final answer:
Eccrine glands produce sweat, which is a watery secretion that aids in thermoregulation and waste excretion.
Step-by-step explanation:
Eccrine glands are responsible for producing sweat, which is a salty fluid that helps with thermoregulation and excretion of waste products. Unlike sebaceous glands, which produce an oily substance called sebum, eccrine glands produce a watery secretion. Sebum is associated with waterproofing the hair and skin and contains antibacterial properties.