As from the very beginning of web promoting, search engine are playing a great role for finding the desired product for everyone who is shopping online.
In this regard, search engine optimization has a great importance for the best promotion of any business over internet.
For doing the best SEO users should build one-way links or buy one way links, otherwise you may do directory submission, dynamic submission, forum submission for getting good google webpage rank by making one way links for the better position in organic search.