What does the Sidebar in a user interface typically contain?

The Sidebar in a user interface typically serves as a navigation tool that provides menu links for easy access to different areas or functionalities of the application. It enhances user experience by presenting organized, quick-access links to frequently used features or sections within the application, enabling users to navigate efficiently without cluttering the main workspace.

This design allows users to focus on their primary tasks while having instant access to other relevant sections of the application, making it a crucial element of user interface organization. Choices related to data input, graphical representations, or header information do not fundamentally define the Sidebar's purpose, which is predominantly centered around navigation through menu links.