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Haskell is a statically typed functional programming language. It’s popular for academic research, rapid prototyping, and developing complex systems. Haskell uses type inference to make code concise and readable while reducing the need for explicit type signatures. The language incorporates pure functions that operate on immutable data; this helps prevent side effects and makes it easier to reason about program behavior. Haskell also provides advanced features like higher-order functions, type classes, pattern matching syntax, monads (which facilitate I/O actions), lazy evaluation with infinite data structures as well as parallelism and concurrency through libraries such as STM (Software Transactional Memory).