There are three states of matter: solids, liquids and gases. Each state of matter has a unique set of characteristics that involve their shape and matter. 

Solids are said to have both a definite shape and a definite volume. 

Liquids are defined as having definite volume but no definite shape. 

Gases are characterized has having neither definite shape nor volume. 

Orange juice is liquid. Therefore, it has no true shape of its own (indefinite shape). Orange juice will take the shape of any container (jug, cup, etc.) in which it is poured.  Being a liquid means that orange juice does have a true volume. This can be measured using a graduated cylinder. The scientific unit that is used for liquid volume is the liter or any metric version of the liter (milliliter, centiliter etc.).