I want to know the answer^_^

Like the yellow pages, if nothing else.

Internet marketing is now a huge business, and growing rapidly. Internet marketing is a big part of most marketing plans.

Did you have a more specific question?

Indeed Nancy. Your question is rather vague and obscure.

WEBSITES ARE VERY CRUCIAL FOR BUSINESS.TODAY THEY CAN HELP PROMOTE BUSINESS BY GIVING US SOME VALUABLE INFORMATION.SOMETIMES WE GET IMPORTANT CONTACTS OF BUSINESS PERSONALS THROUGH WEBSITE

There are many effective ways to promote your business for free:
1. Local listing; for examples Google local , Yahoo local and yellow pages.
2. Social Media like Facebook, Twitter and Linkedin
3. Syndicate Your Content and Ideas
4. Press Releases

Great answer Matt but not sure if it is the appropriate answer to the question.

help us do some shopping stay at home, no need hang out.

A website make your your business's info available 24*7 to users, any one can visit at your website and got it. This way you may promoted. You can also use social media for viral marketing and promoting your business.

In addition to the aforementioned, one is not faced with the biases or prejudices relative to typical consumer behaviors. If you are obese, a little person, flatulent, have a Don King hairdo, or all of the above, you may enjoy the comfort of your chaise lounge and conduct business with your website as your storefront, as you're sipping on a Snapple. Also, you open up your virtual doors to the world, not just your immediate market area.
I have a feeling that you know this already. Is there some underlying impetus to this question?