## TL;DR

Scala (Martin Odersky, 2004, EPFL) elegantly combines object-oriented and functional programming on the JVM. Scala 3 (2021) redesigned with optional braces (Python-like), enums, extension methods, and given/using for implicits. Used by: Twitter (originally), Netflix, LinkedIn, Apache Spark.

## Core Explanation

Functional features: pattern matching, case classes, for-comprehensions, immutable collections. Scala 3: `enum Color { case Red, Green, Blue }`. Given/Using: context parameters (cleaner implicits). Type system: union types, intersection types, dependent types. Apache Spark: written in Scala, with Scala/Python/Java APIs. Akka: actor-based concurrency (now Cloudflow).

## Further Reading

- [Scala Documentation](https://docs.scala-lang.org/)