Orange juice is a popular beverage made from orange

Orange (fruit)

An orange—specifically, the sweet orange—is the citrus Citrus × sinensis and its fruit. It is the most commonly grown tree fruit in the world....

s. It is made by extraction from the fresh fruit, by desiccation and subsequent reconstitution of dried juice, or by concentration

Concentrate

A concentrate is a form of substance which has had the majority of its base component removed. Typically this will be the removal of water from a solution or suspension such as the removal of water from fruit juice...

 of the juice and the subsequent addition of water to the concentrate. The term "orange juice" or "OJ" is also used, both colloquially and commercially, to refer to all of these forms.
Citrus juices contain flavonoid

Flavonoid

Flavonoids , are a class of plant secondary metabolites....

s (especially in the pulp

Juice vesicles

The juice vesicles of a citrus fruit are the membranous content of the fruit’s endocarp. The vesicles contain the juice of the fruit. The pulp is usually removed from the juice by filtering it out...

), that may have health benefits.