The genus name Carya derives from the ancient Greek word karyon (κάρυον), which was used broadly to refer to nuts. The species name illinoinensis refers to the state of Illinois in the United States, where the species occurs naturally across extensive areas. Pecan is well known for its highly nutritious nuts, which have significant commercial value.

Pecan is a deciduous tree belonging to the family Juglandaceae. It is native to North America and occurs naturally in temperate and subtropical regions, mainly in the southern United States and Mexico. Today, it is widely cultivated in many parts of the world to produce high-nutritional-value nuts.

The tree can reach a height of 20–40 meters and develops a strong, deep root system. The trunk is straight, with greyish brown bark that becomes deeply furrowed with age. The crown is broad and dense, providing significant shade. The leaves are compound, pinnate, composed of many lance-shaped leaflets that are bright green and turn yellow in autumn.

Flowering occurs in spring. The species is monoecious, bearing both male and female flowers on the same tree. Male flowers form long, pendulous catkins, while female flowers are smaller and less conspicuous. The fruit is an elongated drupe with a thin husk enclosing the edible seed (the pecan), which matures in autumn.

Pecan thrives in warm and humid climates with a long growing season. It prefers deep, fertile, well-drained soil, especially sandy-loam or alluvial soil. It has moderate drought tolerance, but it is sensitive to severe frost, particularly in its early growth stages. Adequate sunlight is essential for good fruit production.

Propagation is mainly carried out by grafting onto rootstocks of the same genus, as this ensures higher productivity and better resilience. The tree grows relatively slowly in its early years, but develops a long lifespan. It may be affected by insect pests and fungal diseases, especially under high humidity conditions.

The pecan is cultivated primarily for its nuts, which are rich in fatty acids, proteins and antioxidants. They are widely used in confectionery and the food industry. The wood also has commercial value and is used in construction and furniture making, while the tree itself is also planted as an ornamental one in large gardens and parks.