No matter how great your web site is, it is only useful if it is accessible.
Most people find web sites through a search engine.
To make sure your site is listed when a search is made which ought to list your site, you need to get your site promoted. It is also important to link the site to other sites which are related to the business, e.g. principals, trade associations, business partners, etc. Most service providers hosting your web site will submit your home page once to the top handful of search engines. There are hundreds of search engines in use. In many countries, local search engines are more popular than the great global ones.