Web Storage is a web technology that allows websites to store data in a user's browser. It provides a way to save information like user preferences, session data, or any other data that needs to persist between page reloads. This storage is accessible only to the same origin, meaning that only the website that created the data can read or modify it. There are two main types of Web Storage: localStorage and sessionStorage. localStorage retains data even after the browser is closed, while sessionStorage only keeps data for the duration of a single browser session. Both types help improve user experience by enabling faster access to frequently used data.