The term for a period of ten years is "decade." This term comes from the Greek word "dekas," which means ten. Decades are often used to group years for historical, cultural, or sociological analyses, making it easier to reflect on trends and significant events. For instance, the 1980s and 1990s are commonly referred to by their respective decades, encapsulating the distinctive cultural and historical attributes of each time period. Additionally, the concept of decades helps in studying generational changes and in highlighting advancements or shifts in various fields, such as technology, fashion, and politics.