Development boards and kits for AVR microcontrollers are designed for developers to build customized embedded applications. These boards provide the platform for practicing and developing with AVR microcontrollers. The kits typically include a specific AVR-based microcontroller, development board, debugger and some initial software to get you started. Development boards and kits are great for prototyping and can help speed up the development process. The development boards are also customizable, allowing users to incorporate additional components like sensors, communication modules, and other peripherals.