Sigmoid curve

A sigmoid curve is a graph that shows how something grows or changes over time, starting slow, then accelerating, and finally leveling off. Think of it like a new idea or product: adoption begins gradually, speeds up as more people accept it, and then slows down as most interested individuals have adopted it. This S-shaped curve is common in natural and social processes, such as population growth, technology adoption, and learning curves. It helps visualize how growth accelerates and stabilizes, providing insights into timing and potential limits of change.