A decade is a period of ten years. It is commonly used to group years for historical, cultural, or social analysis. For example, the 1980s is often remembered for its music, fashion, and significant events like the rise of MTV and the end of the Cold War. Decades can also reflect trends and changes in society. Each decade often has its own unique characteristics, such as technological advancements or popular movements. The 2000s, for instance, saw the rise of the internet and social media, which transformed communication and information sharing worldwide.