What are one way links?
Backlinks are hyperlinks which direct customers to your webpage (moreover called as inbound links).
The quantity of one way links indicates the publicity of a website.
One way links are useful for SEO because some search engines, especially Google, will give many credits to sites that have good quality permanent links, and consider the websites more relevant than others in their result webpages for a search query.

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backlinks are the incoming links or inbound links that are coming from other web node to yours. it is very qualitative since those are the reciprocal links from those sites which found some useful related information in your site related to their queries. when it comes to backlink services directory submission is the best way. because directory submission is a process where you submit your site url directly to other sites which has high page rank. one important thing about back links is that you cant submit your site url in all websites. you have chances to get your site penalized. your site url should be submitted to a site which is connected to your site in some way. so while submitting urls in websites which is related to your site helps you in getting good back links. so directory submission is the best way. you can either do it by yourself or you can get the assistance from providers. but all seo strategies are difficult to do it manually and it will take long time so it is better to get assistance from seo service providers who provides these for your site. i got the seo package for my site from XnYnZ.com. they did all the seo services for my site instead of me.