Mender is an over-the-air (OTA) software update solution for Internet of Things (IoT) devices. It provides a comprehensive infrastructure for remote management and deployment of device software updates without manual intervention. Mender supports updates for device software, full images, applications, files, containers, bootloaders, and peripherals like microcontrollers or sensors. It is designed to work with Linux-based operating systems and integrates with existing CI/CD pipelines.