#1 is the Parotid gland; #2 is the Submandibular gland; #3 is the Sublingual gland.
The salivary glands make saliva. Saliva keeps the mouth and other parts of the digestive system wet and slippery. They also help break down the food when you are chewing. This helps food go down the throat to the stomach.
There are three main pairs of salivary glands. They are
the parotid,
the submandibular and
the sublingual glands.
There are also many small glands in the tongue, cheeks, lips and palate. All of those glands make mucous.