Local Storage
Local Storage is a web browser API that allows websites to store key-value pairs of data persistently in a user's browser, with no expiration date. It provides a simple, synchronous storage mechanism for client-side data, typically used for caching, user preferences, or session state. Unlike cookies, Local Storage data is not sent to the server with every HTTP request, making it efficient for storing larger amounts of data (up to about 5-10 MB per origin).
Developers should learn and use Local Storage for scenarios requiring persistent client-side data storage, such as saving user settings (e.g., theme preferences), caching application state to improve performance, or storing offline data in web apps. It's particularly useful in single-page applications (SPAs) to maintain state across page reloads without server interaction, but it should be avoided for sensitive data due to security risks like XSS attacks.