Well-mannered, serious and very cautious, Trunks hails from an alternate timeline in which Future Androids 17 and 18 murdered the Dragon Team and proceeded to create an apocalyptic anarchy on Earth. Trunks is trained by Future Gohan as a teenager and becomes a gifted fighter, swordsman and a Super Saiyajin.

Trunks is the son of Bulma and Vegeta. Half Saiyajin and half human, just like Gohan and Goten. Trunks was surrounded by a scientific environment. Having his mother and grandfather as scientists, he became very intelligent at science.

(Source: Dragon Ball Wiki)