The talk is about the Raspberry Pi, a small single-board computer that can run different Linux distributions and be used for a variety of projects by Java developers. The speaker shares their personal experience with Java on Raspberry Pi, as well as the development and launch of the Pi4J library, which allows for control of electronic components. They also discuss updates to the library, such as a Kotlin implementation and integration with Spring Boot. The talk concludes with a preview of upcoming projects involving the Raspberry Pi and Java.