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okay, let's dive into a comprehensive tutorial on using `sessionstorage` in javascript. this guide is designed for beginners, so we'll start with the basics and gradually move towards more advanced concepts with clear examples.

*what is session storage?*

`sessionstorage` is a web storage api that allows you to store data in a web browser for a *single session*. this means the data persists only as long as the browser tab or window is open. when the user closes the tab/window, or the browser itself, the data stored in `sessionstorage` is automatically deleted.

*why use session storage?*

*temporary data storage:* ideal for storing information that is relevant only during the current browsing session, like shopping cart data, user preferences, or temporary login details.
*security:* session storage data is only accessible by the script that originally stored it from the same origin (protocol, domain, and port). this makes it slightly more secure than cookies for sensitive data since it's not easily accessible from other sites.
*simple api:* the api for `sessionstorage` is very easy to use, making it a quick and efficient way to manage session-based data.
*no server interaction:* unlike cookies, data stored in `sessionstorage` is not sent to the server with every http request. this reduces network traffic.
*larger storage limit:* `sessionstorage` usually offers more storage space (typically 5-10 mb) compared to cookies (around 4kb).

*key concepts and methods*

`sessionstorage` is a property of the `window` object in browsers. it provides the following essential methods:

*`setitem(key, value)`:* stores a key-value pair in session storage. both the `key` and `value` must be strings.
*`getitem(key)`:* retrieves the value associated with a given key from session storage. returns `null` if the key doesn't exist.
*`removeitem(key)`:* removes the item associated with a given key from session storage.
**`c ...

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