Apache Flink is an open source framework for data processing that supports various languages, including SQL. This blog post provides a way to get Apache Flink's SQL Client as a set of Docker containers and includes an example of integrating a local CSV file with PostgreSQL using Flink's SQL pipeline. The tutorial also covers setting up Apache Flink locally with Docker Compose, unleashing the power of SQL, creating a data target in PostgreSQL, and wrapping up the process.