Can backlinks be beneficial to both parties?

[Autofresh.in]

Yes backlinks are helpful for both parties but reciprocal links are not preferred by Google as they are considered as link trades between websites.

Hey,
I have one doubt,

inbound links are always welcomed but as you said backlinks are helpful for both parties, how is it possible?

I mean if we have so many outbound links how it can be helpful? please clear my doubt sir.