The ease with which users can find new or unknown features, content, and functionalities within a product or system without prior knowledge of their existence.

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Discoverability is about the user stumbling upon features or content they were not actively looking for, whereas Findability is the ability of a user to locate a specific item that they already know exists.

Source: Nielsen Norman Group, “Discoverability: A UX Concept We Need to Talk About”

Further Reading:

• Campos, P., & Nunes, N. J. (2007). “Towards a model of discoverability for interactive systems.”
• Thudt, A., Hinrichs, U., & Carpendale, S. (2012). “The bohemian bookshelf: supporting serendipitous book discoveries through information visualization.”