The website is a multilevel system merging of different services and resources. The website gives the observer information, provides access to search engines, to e-mail, advertizing, etc.
Originally all websites represented set of different static documents. Presently practically from them interactivity and dynamism is peculiar to all. In such cases the specialists use the term "web application" — a ready program complex for the solution of specific objectives of any website. The web application is a part of the website, however the web application without the entered data the website is only technically.
Often on the Internet to the same website there corresponds only one name of the domain. On a domain name the websites are also identified in world network. But there are also other options: the same website is registered on several domains or several websites exist under one domain. Generally more than one domain use the large websites or as still they are called - web portals. It becomes logically to separate different types of the provided services. Often meets when separate domains use for selection of the websites of the different countries or languages. Association of several websites under one domain is characteristic of many free hostings.
For storage of websites use hardware servers which are called Web servers, and call service of saving a web hosting. Earlier each website was stored on the server, but with development and growth of the Internet, technological improvement of servers it is possible to place a set of the websites, a so-called virtual hosting on one computer now.
The same website can be available to the different addresses and is stored on different servers. In that case, the copy from the original website is called a mirror. Also there are offline versions of the websites, i.e. the copy of the website available for viewing on all computers without connection to network and use of the server software.
There is a huge number of various classifications of websites which basis different parameters and characteristics are. Purpose of the website defines its appearance, information fullness and some other parameters.