Human

Humans are a species that originates from Earth. Humans are sometimes referred to as Terrans. Some people use the term "Terran" to refer to things or institutions associated with humanity (Terran cuisine, Terran literature, Terran art, etc).

Human philosophy
The philosophy of most Humans revolves around self-enlightenment and the bettering of society as a whole. A Human's moral goal is the achievement of knowledge through peaceful exploration, as recognized in Starfleet's Prime Directive of non-interference with other cultures.

Humans have found a sense of balance in their lives and attitudes. Compassion, courage, and intellect that have been developed into an ideal combination, with ambitions of further self-improvement. Greed and selfishness have faded on a mass scale as technological progress opened humanity's possibilities. Deviations from these ideals are rare and considered abnormal behavior for humans.

Many alien cultures have found humanity confusing, due (in part) to the fact that humans are mostly very hesitant to engage in conflict, but would fight with lethal force as a last resort. This inherent conflicting nature made Earth an ideal choice in mediating disputes and finding common ground in interstellar affairs, where the more experienced Vulcans had failed.