Drinkware or Beverageware is a general term for the class of vessels from which people drink.

Glassware is a class of objects that include drinkware made from glass as well as other items.

Stemware is a subcategory of drinkware that stand on stems.

A glass is a drinking vessel made from glass. Glasses are often clear, but are sometimes coloured, or printed or etched with decorations.
Compared with a cup which is defined as having a handle and hold exactly one cup of liquid, a glass stands taller without a handle and usually holds more liquid.