What is HTML Web Storage?

HTML Web Storage is a system used in web applications to store data in a web browser. It is a part of the Web storage application programming interfaces (APIs) like the localStorage and sessionStorage properties, which are part of the global window object.

Here are the steps to explain what HTML Web Storage is:

1. Introduction to Web Storage: Before the advent of HTML Web Storage, cookies were primarily used for storing data. However, they were not very efficient and had several limitations. HTML Web Storage was introduced to overcome these limitations.

2. Types of Web Storage: There are two main types of web storage: Local Storage and Session Storage. Local Storage stores data with no expiration date, and the data is not deleted even when the browser is closed. On the other hand, Session Storage stores data for one session, and the data is deleted when the browser tab is closed.

3. Advantages of Web Storage: HTML Web Storage can store a large amount of data (up to 5MB) without affecting the website's performance. The data is stored in a key-value pair format and it never gets transferred to the server, which makes it a secure way of storing data.

4. Usage of Web Storage: HTML Web Storage is used in web applications for various purposes like caching data, storing user information, and even saving user preferences for a website.

5. Accessing Web Storage: Web Storage can be accessed through JavaScript using the localStorage and sessionStorage objects. For example, to store data you can use localStorage.setItem('key', 'value') and to retrieve data you can use localStorage.getItem('key').

In conclusion, HTML Web Storage is a powerful tool for web developers to store data in the user's browser, providing a more efficient and secure way of handling data compared to traditional methods like cookies.