Memoization with Fibonacci

Memoization, commonly known as caching is a key technique we can use for performance optimization in programming. Memoization simply stores the results from a previous computation for later retrieval whenever the arguments are presented again. The ability to re-use these, often expensive functions, brings significant performance improvements - especially in scenarios with repetitive computations. In F#, memoization is not only a helpful optimization but also a natural fit due to the language’s immutable data structures and functional nature.