Amazon contributes to open source projects for several reasons: to better serve customers by supporting popular open source technologies, drive innovation by collaborating with the open source community, reduce maintenance costs by fixing issues upstream, and improve quality and security by incorporating community feedback. Some examples of projects Amazon contributes to include Docker, Kubernetes, Apache Spark, and Linux kernel. Amazon engages with the open source community through its website, Twitter account, and blog to share updates on its open source efforts.