The A4 Chip is a custom-designed processor created by Apple Inc. for use in its devices. Introduced in 2010, it was the first chip designed specifically for the iPhone, enhancing performance and energy efficiency. The A4 chip integrates a CPU and GPU on a single chip, allowing for improved graphics and faster processing speeds. This chip powered several devices, including the iPhone 4 and the iPad, marking a significant step in mobile technology. The A4's architecture laid the groundwork for subsequent chips in the A-series, which continue to evolve and drive the performance of modern Apple products.