Development boards, kits, and programmers are tools that are used in the development, testing, and programming of electronic circuits and devices. A development board is a printed circuit board that contains a microcontroller or other processing unit, along with a set of connectors, components, and interfaces, which can be used to build and test a variety of electronic circuits. Development boards are commonly used in prototyping, experimentation, and education, and can provide a convenient and flexible platform for developing and testing new ideas or concepts. Development kits are collections of hardware and software components that are designed to work together to create a specific type of device or application. They may include development boards, sensors, actuators, connectors, cables, and software libraries, as well as documentation and examples, which can help users to quickly and easily build and test their own projects. A programmer is a device that is used to load, debug, or modify the firmware or software that runs on a microcontroller or other processing unit. Programmers may be connected to the target device using a wired or wireless interface, and may be used to upload new programs, debug existing programs, or perform other tasks. Development boards, kits, and programmers are commonly used in a wide range of applications, including electronics, robotics, and Internet of Things (IoT).