A web page means it contains some information, content, an awareness or a technology.
By reading, seeing or storing that page we will get some benefit in many aspects.
Suppose i can suggest a best online shopping experience in a particular website as a best review on that site.
By reading that you can also get some awareness. And you may share it on twitter, pinterest and face book.
In that way it will spread to end users.
The aim of Search Engine Optimization is to bring leads/clients/customers to improve the business growth.
As per Google nofollow links have no contribution to website ranking but indirectly it is creating
benefits. So try to focus on nofollow links as well to get best ROI (Return On Investment).