Series 40 is a mobile phone software platform developed by Nokia. It was primarily used in feature phones and was known for its user-friendly interface and support for various applications. Launched in the early 2000s, it allowed manufacturers to create affordable devices with essential features like calling, texting, and basic internet access. The platform supported a range of multimedia capabilities, including music and video playback, as well as camera functionality. Over time, Series 40 evolved to include touch-screen support and enhanced web browsing features, making it a popular choice for budget-conscious consumers before the rise of smartphones.