Shared Preferences is a storage mechanism commonly used in Android mobile applications to save simple data such as user settings, preferences, or configuration information. It allows apps to store key-value pairs locally on the device, making it easy to retrieve and modify small amounts of data across app sessions. Shared Preferences is not intended for storing large or sensitive data, as it does not provide robust encryption by default. Developers often use it for lightweight, persistent storage needs, such as remembering a user's login state or app theme selection.