The Nokia Series 40 is a mobile phone platform developed by Nokia, primarily used in feature phones. Launched in 1999, it provided a user-friendly interface and supported various applications, games, and multimedia features. The platform was known for its reliability and long battery life, making it popular in emerging markets. Over the years, the Nokia Series 40 evolved to include color screens, cameras, and internet connectivity. It played a significant role in the mobile phone industry before the rise of smartphones, with millions of devices sold worldwide. The platform was eventually succeeded by more advanced operating systems.