Apple-designed processors, collectively marketed by Apple as Apple silicon, are system on a chip (SoC) and system in a package (SiP) processors designed by Apple Inc., mainly using the ARM architecture. They are the basis of Apple's iPhone, iPad, and Apple Watch platforms, and of products such as the HomePod, iPod touch, and Apple TV. Apple also designs a SoC called the Apple H1 for its AirPods line of wireless headphones.