This document introduces the PSoC 3, which is described as the world's only programmable system on chip (SoC). It integrates configurable analog and digital peripherals, memory and a microcontroller onto a single chip. This was the first programmable SoC and offers benefits over traditional embedded solutions like reduced board costs, power efficiency, flexibility for changing specs, and the ability to address complex mixed-signal requirements with one programmable device. The document lists industries that use PSoC and different PSoC products.