A printed circuit board, or PCB, is used to mechanically support and electrically connect electronic components using conductive pathways, tracks or signal traces etched from copper sheets laminated onto a non-conductive substrate. wikipedia.org

An embedded system is a computer system designed for specific control functions within a larger system. often with real-time computing constraints. It is embedded as part of a complete device often including hardware and mechanical parts. wikipedia.org

"In electronic systems and computing, firmware is "the combination of a hardware device, e.g. an integrated circuit, and computer instructions and data that reside as read only software on that device" wikipedia.org

A microcontroller is a small computer on a single integrated circuit containing a processor core, memory, and programmable input/output peripherals. wikipedia.org

Embedded Linux is the use of Linux in embedded computer systems such as mobile phones, personal digital assistants, media players, set-top boxes, and other consumer electronics devices, networking equipment, machine control, industrial automation, navigation equipment and medical instruments. wikipedia.org

Embedded C is a set of language extensions for the C Programming language by the C Standards committee to address commonality issues that exist between C extensions for different embedded systems. wikipedia.org

Software development is the process of conceiving, specifying, designing, programming, documenting, testing, and bug fixing involved in creating and maintaining applications, frameworks, or other software components. wikipedia.org

The internet of things (IoT) is the network of physical devices, vehicles, buildings and other items. It is embedded with electronics, software, sensors, and network connectivity that enables these objects to collect and exchange data. wikipedia.org