Selecting this option will redirect all sub pages of the Website URL:
If your Website URL is http://mywebsite.com, then all pages http://mywebsite.com/blog, http://mywbsite.com/blog/article, http://mywebsite.com/shop etc. including http://mywebsite.com will get redirected
If your Website URL is http://mywebsite.com/shop, then all pages of the shop, http://mywebsite.com/shop/productA, http://mywebsite.com/shop/productB etc. including http://mywebsite.com/shop will get redirected.
If this option is not selected then only the specified page URL will be redirected: