Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.
SharePoint libraries are lists intended to be used for managing documents. Their list items are focused on the files attached to them, with features specific to handling the creation and editing of those files, such as requiring check in/check out, versioning, and content approval. Libraries make it easier for users to work together on documents in a consistent and secure manner.
Libraries are often the most compelling reason people even consider using SharePoint. They are generally the foundation of the collaborative work users might need to accomplish; be it sharing documents, spreadsheets, slideshows, or forms.