Why adding version number to CSS file path?

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From HTML5 ★ Boilerplate Docs:

What is ?v=1″ ‘?v=1’ is the JavaScript/CSS Version Control with
Cachebusting

Why do you need to cache JavaScript CSS? Web page designs are getting
richer and richer, which means more scripts and stylesheets in the
page. A first-time visitor to your page may have to make several HTTP
requests, but by using the Expires header you make those components
cacheable. This avoids unnecessary HTTP requests on subsequent page
views. Expires headers are most often used with images, but they
should be used on all components including scripts, stylesheets etc.

How does HTML5 Boilerplate handle JavaScript CSS cache? HTML5
Boilerplate comes with server configuration files: .htacess,
web.config and nginx.conf. These files tell the server to add
JavaScript CSS cache control.

When do you need to use version control with cachebusting?
Traditionally, if you use a far future Expires header you have to
change the component’s filename whenever the component changes.

How to use cachebusting? If you update your JavaScript or CSS, just
update the “?v=1” to “?v=2”, “?v=3” … This will trick the browser
think you are trying to load a new file, therefore, solve the cache
problem.

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