Is SEO beneficial for a business website?

Hi Friends,
I have a business website which is 3 year old, so is it good to have a SEO services for that website?
Thanks

Yes, if you are having a business website then it can be beneficial for your business because SEO opens the door of web world for your organization as it provides exposure to a business website. Because this is the time of internet and if you want to make your web presence impressive, then SEO is the right way to go for.

It's more than beneficial. It's crucial, essential... mandatory.

Here's a resource I've become a fan of lately:
http://www.seomoz.org/beginners-guide-to-seo

There are TONS of others. If you're looking for ways to increase the page rank of your own site, NEVER pay a company that says it will submit your site to search engines. That's was helpful back in the old days of the web. Today, it's an indication that either someone doesn't know what they're talking about, or they're trying to take your money.