Seasonality refers to the predictable changes that occur in certain phenomena or activities at specific times of the year. This concept is commonly observed in nature, such as the changing of the seasons—spring, summer, fall, and winter—which affect weather patterns, plant growth, and animal behavior. In business, seasonality can influence sales and consumer behavior. For example, retailers often see increased sales during the holiday season, while ice cream shops may experience higher demand in the summer months. Understanding seasonality helps businesses plan inventory and marketing strategies effectively.