Haskell is a statically typed functional programming language known for its strong type system and expressive syntax. It is widely used in the development of blockchain and cryptocurrency projects due to its focus on correctness, reliability, and maintainability. Haskell's pure functional nature and static type checking make it well-suited for building secure and high-assurance software systems. Its strong emphasis on immutability and referential transparency aligns well with the principles of blockchain technology, enabling developers to write robust and predictable code. Haskell has a thriving ecosystem of libraries and tools that support blockchain development.