The programming language specifically designed for building data-intensive applications is Scala. Its functional programming features and performance advantages make it suitable for big data processing. Scala operates seamlessly with Apache Spark, a powerful open-source engine for data analytics on large datasets, enabling efficient computation. It supports concurrent processing, which is essential in handling multiple data streams. Scala's interoperability with Java allows developers to leverage existing Java libraries while benefiting from concise syntax and advanced type systems, fostering robust data applications in diverse environments.