Boo is a statically typed, object-oriented programming language created by Rodrigo B. Cortés.
Boo was designed to be a smaller, faster, and more extensible alternative to Microsoft's C# language. It borrows features from both Python and C#.
One of Boo's primary goals is to be an alternative to C# that is more suited to dynamic languages. For example, C# requires that all methods be statically typed, while Boo uses a more flexible type inference system that allows methods to be dynamically typed.
Boo also has a number of features that make it more suitable for dynamic languages. For example, it has built-in support for metaprogramming and duck typing.
Metaprogramming is a technique for writing code that generates code. This can be used to write code that is more concise, or to automate the generation of code.
Duck typing is a programming technique that allows objects to be used interchangeably, without requiring them to have the same type. This is useful in dynamic languages, where the type of an object may not be known ahead of time.
Boo has been used in a number of high-profile projects, including the Unity game engine and the Mono open source project.