Final answer:
Extraversion, in Eysenck's personality theory, refers to a trait characterized by sociability, outgoingness, and a preference for social interactions over solitude.
Step-by-step explanation:
In Eysenck's personality theory, one of the main features is the trait of extraversion. Individuals who score highly on the extraversion scale are typically characterized as sociable and outgoing. They enjoy connecting with others and actively seek out social interactions. Extraverts are contrasted with introverts, who have a greater need for solitary time and are more reserved in their interactions with others. Hans and Sybil Eysenck pioneered this approach, emphasizing that personality is underpinned by biological factors. They divided people into four quadrants based on two dimensions: extraversion/introversion and neuroticism/stability. Extraversion is also one of the five facets of the widely recognized Big Five personality factors, which also includes openness, conscientiousness, agreeableness, and neuroticism.