It allows users to access the web apps on a web browser of their choice, without a difficulty. They also have the option to use all functionality of the site just by enabling the scripting language (if it is disabled).
3. Easy to reduce load on server: The speed of a web app determines its usability. In order to maintain the performance of a web app, the server-side scripting languages need the web server to formulate the user request before sending the response to the user. So, this entire process required extra time despite the user having a super-high internet speed.
This increases the speed of your site or web app and improves its overall performance by offering upgraded information to the user like a breeze.
Once code has been placed in a separate file, you can save it with .js extension. Thereafter, you can link this file to multiple web pages using the <script> tag to the HTML code of the page.
The option further lets you avoid writing extra code while adding the same functionality to the other sections of the site.