The styleboard is actually a first step towards a style guide, in which you describe the application of the design language to the various components (and their appearance). The translation to screen designs can be done in various ways. The components can be used to very quickly create screen designs (in Fireworks or Photoshop, for example) and together with the interaction design they form sufficient support for a developer. The moodboards (and in particular the design and styleboards) are a good reference point for design decisions that have to be made later.
Lately, you also hear a lot about 'designing in the browser'. Mood boards can also play an important belgium telegram data role in this. When designing in the browser, many design decisions are made during the development of the front-end. A good set of mood boards is then the benchmark for the style and ensures a consistent implementation. the responsive design process? I'd love to hear them in the comments below!