Session Storage is a web storage feature that allows websites to store data temporarily in a user's browser. This data is only accessible during the current browser session, meaning it is cleared when the tab or browser is closed. It is useful for maintaining user preferences or information while navigating a site without needing to send data back to the server. Unlike Local Storage, which retains data even after the browser is closed, Session Storage is designed for short-term use. It can hold key-value pairs, making it easy for developers to manage user interactions and improve the overall experience on their websites.