The endocrine system is a system of glands that produce hormones which regulate various bodily functions. Endocrine glands are ductless glands that secrete hormones directly into the bloodstream. Examples of endocrine glands include the pituitary gland, thyroid gland, and adrenal glands.
In contrast, exocrine glands are glands that secrete hormones through ducts to a target area. Examples of exocrine glands include sweat glands, salivary glands, and pancreatic glands. These glands secrete substances such as sweat, saliva, and digestive enzymes.