The Qin dynasty was the first imperial dynasty of China, lasting from 221 to 206 BCE. It was founded by Qin Shi Huang, who is famous for unifying the country and establishing a centralized government. The dynasty is known for its significant achievements, including the construction of the Great Wall of China and the development of a standardized system of writing, weights, and measures. The Qin dynasty also played a crucial role in shaping Chinese culture and society. It introduced legalism as a governing philosophy, emphasizing strict laws and harsh punishments. Despite its short duration, the Qin dynasty laid the foundation for future dynasties and left a lasting legacy in Chinese history.