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Scala was designed to fix Java's verbosity while keeping access to the entire Java ecosystem. It runs on the JVM, uses Java libraries seamlessly, and adds functional programming features — pattern matching, immutable collections, type inference, higher-order functions — that make code dramatically more concise. A Scala program can be half the line count of equivalent Java.
The language's biggest success is Apache Spark, the dominant big data processing framework, written in Scala. Kafka (LinkedIn), Twitter's backend, and numerous financial systems use Scala. The language attracts developers who want JVM reliability with modern language features. Scala 3 (Dotty) simplified the language significantly, addressing complaints about excessive complexity.
IntelliJ IDEA with the Scala plugin is the standard IDE — its type inference and error detection are essential for a language with such a sophisticated type system. VS Code with Metals (the Scala language server) is a lighter alternative. SBT (Scala Build Tool) manages project builds and dependencies.