It means load only the code for the page/route that you are visiting and not the code of entire site. Suppose you visit only example.com/about-us page then why

It means load only the code for the page/route that you are visiting and not the code of entire site. Suppose you visit only example.com/about-us page then why should the server load example.com, example.com/faq, example.com/blog code together with it? I hope you got the point of code-splitting. :)