Linking is important ranking guide for search engines.
If you have links pointing to your website that increases your ranking.
Quality of links is good also – a high quality link from a relavent website may be worth x10 or x20 regular links.
An example would be a good link from About.com pointing to your website. Furthermore it would be ‘on-topic’.
In any case relevant links are worth lots. Irrelevant links still carry a value and should be ignored either.
