The term "extra storage" refers to additional space or capacity that is available for storing data, files, documents, and other digital content. This can be in the form of external hard drives, cloud-based storage services, or even expandable memory cards on a device such as a smartphone or tablet. The extra storage provides an opportunity to save more information than what would typically fit on a device's built-in storage capacity, allowing users to store and access their data without worrying about running out of space.