What is Stream API?

The Stream API is a powerful feature in Java (introduced in Java 8) that provides a functional approach to processing collections of objects. It allows for performing operations like filtering, mapping, and reducing data in a declarative and concise manner. Streams are not data structures; they take data from a source (like collections, arrays, or I/O channels), perform operations, and produce a result, without modifying the original data source. They are commonly used for data manipulation, data aggregation, and parallel processing.