Business benefits of SEO
Search Engine Marketing helps site owners meet their various online marketing objectives such as generating leads, sales or simply building awareness.

Cost-effective Customer Acquisition
There is no payment to the search engines for being indexed. This is important for high volume, low intent phrases which can be expensive in paid-search (eg 'car insurance'). It can also be useful for generating visitors on the long tail of search. Many companies bid on these phrases through paid-search, so giving opportunities for those who use an SEO strategy for the tail.