L2, or second language, refers to any language learned after a person's native language, known as L1. It can be acquired through formal education, immersion, or self-study. Learning an L2 can enhance cognitive abilities, improve career opportunities, and foster cross-cultural communication. The process of acquiring an L2 involves various skills, including listening, speaking, reading, and writing. Factors such as age, motivation, and exposure play significant roles in how effectively someone learns a second language. Popular L2s include Spanish, French, and Mandarin, each offering unique cultural insights and practical benefits.