Shared hosting is accommodation of a site on the general platform near to hundreds sites of other users.

Ordering a virtual hosting, you rent at the provider a place on one of its servers and use all resources of a computer (operational system, the software, width of the channel) together with other sites.

There are two types of a virtual hosting: named-based and ip-based. Differences between them are minimal, but in some cases are essential. As a rule, the virtual hosting is on sale in the form of packages - XX Gbyte of the traffic, a parking of several domains, etc. At that in case of excess of a limit you should pay everyone Gbyte the traffic, plus at the some people HSP is feature named "CPU time used" for which excess also it is necessary to pay.

It is characterized by that on one server with you the set of other clients of a hosting settles down. That is, when all computer, but only its part is given to the client. One computer is divided between several clients which sites refer to virtual. It uses headings HTTP/1.1 received from the client for definition of a name of a host. It allows many various domains to use the same IP the address.

Advantages of the name-based virtual hosting - to you personally do not need to be able to be administered UNIX or WinNT since administrators HSP will make all necessary for support of trouble-free work of a server. But, as a rule, you should pay in addition for installation of modules necessary for you to Perl, or recompilation PHP with support of functions necessary for you.

Granting of this type of a hosting is caused by that ip-addresses in a network catastrophically do not suffice and though ip-addresses stand out free of charge, HSP it is necessary to present very much strong reasons for their reception, therefore frequently hosting providers are simply compelled to give such type of a hosting.

Lacks of name-based Virtual Hosting:

• Problems, for example that the script of any client has loaded memory and the processor of the machine under 100% are sometimes possible, or site any client has suddenly started to consume the most part of throughput of the channel allocated under a server on which also your site also is physically located. Usually such problems are solved hosting provider, and in short terms, but in fact even half-hour time of inaccessibility of a server can turn back large losses for you.
• At name-based a virtual hosting all domains (you and neighbors) live on one ip-address in spite of the fact that domain names at you different, that imposes some restrictions, namely, the Web-server distinguishes your domains on value of field GET of http-inquiry.

The same is absolutely, as name-based except that under each domain to you the separate ip-address stands out and you do not lose users with old browsers.

Summed up to all aforesaid, still time we shall remind the basic requirements of a qualitative hosting:

• Fast a server - qualitative hardware and fiber-channel connections. Time of loading a web-pages in inverse proportion to your incomes. Do not trust those who speaks, that a server happen too fast.
• Support and registration of a domain name. Posting provider should register a domain name for your site. The company should make it quickly, not raising an additional payment.
• Any restrictions and an additional payment for the traffic. There is no sense to pay the additional sums for work of a site. Exceptions - sites for adults. The best paid hosting should give the unlimited traffic and all to an option for work of a site.
• Unlimited access to CGI, FTP, Tel-Net. CGI-scripts nevertheless are necessary in work even the most simple site. Make sure, that on a server there is CGI-BIN a directory and you have an opportunity to load into it scripts and to start them. Never pay for a hosting which limits access to CGI.
• 24/7 technical support. The good hosting should give to you an opportunity of dialogue with "alive" technical support by phone and e-mail, and is absolutely free. These are 100% it is necessary.
• The Control panel a site through a web-browser. The majority paid a hosting-services give a web-panel by means of which it is possible to carry out the full control over work of a site. It not obligatory function but to use to it it is very convenient, if you do not understand the technical party of work of a server.
• System of a server security. If you assume work the Internet-shop directly on a server the system of safety is simply necessary. The best variant if the system of safety will be given free of charge, or for a small additional payment.
• Mail. The hosting should give in full a trace: unlimited number POP of mail boxes, answering PCs, an opportunity of viewing of mail through a web-panel. All this should enter into base cost of a hosting.
• Any restrictions on validity of the contract. Never sign the long-term contract. If suddenly you decide to replace a hosting the contract can complicate position.
• The Guarantee of the refund. The qualitative hosting provides 30-day's trial term of using service. In case you will not accept service, you should receive the money back. Necessarily provide for itself such opportunity. It is a sign on professionalism of the company and quality of rendered services.