Before we dive in to the language itself, we should discuss why we need it in the first place. F# is a powerful language, which may sound like a cliché, but it combines multiple paradigms into real-life productivity and supports the .NET components and libraries natively as well as the Common Language Infrastructure (CLI). Functional programming has long been associated with academics and experts. F# is one of the few languages offering a complete environment that is mature enough to comfortably be integrated into an organization.
Also, F# has extensive support for parallel programming, where advanced features such as asynchronous and multi-threaded concepts are implemented as language constructs. It hides a lot of implementation details from the programmer. In F#, the functional programming paradigm is the main philosophy used to solve problems. The other paradigms, object-oriented and imperative programming, are prioritized to be used as subsidiaries and complements for this main paradigm. Reasons for them to coexist, involves compatibility and pragmatic, real-world productivity concerns.