When the loan period ends, you can no longer open the book, and it may get automatically deleted from your device. For example, if you check out an eBook, it becomes available on your device for reading immediately. When the loan period is over, the content is automatically 'returned'. This gives their patrons the ability to 'borrow' content using a computer or mobile device. Libraries purchase collections from a provider. For libraries, it saves on space and staff time, and providers are stepping up to deliver video, music, eBooks and audiobooks electronically.
Public libraries are providing more and more of their content in a digital format.