What is an external brain?

An external brain refers to external tools or systems that enhance cognitive functions, such as technology or resources used to store, process, or retrieve information. Examples include computers, smartphones, and the internet, which provide access to vast amounts of knowledge and facilitate complex problem-solving. In a broader sense, it can also describe social networks or collaborative communities that support learning and decision-making. This concept highlights how humans increasingly rely on external resources to augment their intellectual capabilities.