Factor is a stack-based, concatenative programming language with a very simple and consistent syntax. Programs are written by combining whole words (called "verbs") together, which then take arguments from the stack. Factor has a rich library of built-in functions, which can be used to create more complex programs. Factor is an excellent choice for beginners, as its simple syntax makes it easy to learn. It is also suitable for more experienced developers, thanks to its powerful features and extensive documentation.