Good ranking in Search Engines, High Authority, High PR (if possible!), good number of QUALITY backlinks and of course as low number of Outbound links as possible!
high quality back links are those which comes from relevant high page rank site and from such sites who have strong domain authority.
When it comes to quality of backlinks, then these things can be considered: relevant links natural links slow link building links from authority websites regular links links obtained from providing content links should send visitors to your site
Quality Backlink factors are 1. Backlinks should come from high pr sites 2. Backlinks should be dofollow links 3. Backlinks should come from relevant category sites 4. Out bound link should be low in the site 5. Backlinks should come from high authority sites 6. Traffic should be there from that backlinks
The best Backlinks are the ones that are still on after 24hours Of course there are so many factors that are coming after but first of all you must have them ON.
Back link should be thematic/ relevant, having high page rank with low OBL, and better Domain authority and page authority.
Before you decide to contact some website to get a link there, consider such its qualities as: - relevance of a to your site category; - trustworthiness of a website; - amounts of traffic a website gets; - site authority (Google Page Rank, Alexa Rank, domain age, etc.); - site origin (important if you want to promote a website locally). There are lots of free backlink checker tools that will help you with this task, personally I use Free WebMeUp backlink tool: http://webmeup.com/tools/backlinks.html