Apache Beam is an open-source, unified model for defining both batch and streaming data-parallel processing pipelines. It is a programming model that allows you to define data processing pipelines and run them on a variety of execution engines, including Apache Flink, Apache Spark, and Google Cloud Dataflow. Apache Beam provides a simple, powerful, and flexible way to build and run data processing pipelines that can handle both batch and streaming data. It is designed to provide a reliable, scalable, and cost-effective platform for building and deploying data processing applications and services. Apache Beam is a popular choice for organizations looking to build and deploy data processing systems that can handle large volumes of data and provide high availability and fault tolerance.