Over 8 billion web pages have been indexed by the search engines and this is only part of what makes up the Internet.

There are millions of sites that require passwords to access the data which can't be indexed by the search engine spiders

The largest area is what is called the deep web, a vast reservoir of Internet content that is 500 times larger than the known world wide web.
There are hundreds of billions of highly valuable documents hidden in searchable databases that cannot be retrieved by conventional search engines.
Complete Planet has a list of figures and tables relating to the first-ever study which describes the nature of the deep Web, and quantifies its size, importance and quality.

Where Can My Site Be Seen
Your web site can be reached anywhere on Earth where there is access to a PC or TV with Internet connection to a phone line or mobile phone
In a plane or car on a train or ship - In the remotest country around the globe your site can be accessed by billions of people 24 hours a day 7 days a week

See Also
Could I design my own web site

Can I have pictures on my web site

Can I sell things over the web

Can I make alteration to my web site

How will people find my web site

What are the benefits of having a web site