The "10,000-Hour Rule" suggests that achieving mastery in a skill requires approximately 10,000 hours of dedicated practice. This concept was popularized by author Malcolm Gladwell in his book, Outliers. Gladwell argues that consistent, focused effort over time is essential for developing expertise in fields such as music, sports, and business. The rule emphasizes the importance of practice rather than innate talent. While some individuals may have natural abilities, the idea is that hard work and perseverance can lead to success. This principle has influenced how people approach learning and skill development across various disciplines.