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A web host (or web hosting) is an entity maintained by third parties, that aims to make available generally to anyone, an Internet web site hosting and also offers usually, a web design and other features. 

It provides access of the client to all Internet content deposited in their accounts by using FTP managers or directly from Cpanel File Manager. To do this, the web hosting companies keep their powerful computers turned on and connected 24 hours 24 Internet (eg. web servers) by a high-speed connection (hundreds of Mb / s), on which software are installed: HTTP server (often Apache), mail server, database...

Activity

The main activity of web hosting is to install servers, to secure it, to keep it up to date by installing any security updates to prevent malicious attacks , to repair them in case of failure  and to install software technologies desired by customers.

Web hosting Categories
Most hosting packages are grouped into broad categories, the most known of them are

  1- The shared hosting: Each server hosts multiple sites, up to several thousands, in order to share the costs. The main advantage of this package is the price, the main disadvantage is that the clients are not server “administrator” and they are often depended on the goodwill of the host if they want a particular technology.
    In some configurations of shared hosting, the user can be an administrator of a virtual server, on which the site is deployed. However, he continues sharing system resources with other customers.

  2- Dedicated accommodation: The customer has its own server, and can generally be administered as desired, which is the main advantage of this type of offer. The server vendor remains the owner of the server. The disadvantages are: the price is much higher than shared hosting, and skills are needed to administer the machine correctly.

   3-Virtual dedicated hosting via a hypervisor that offers customers the flexibility of a dedicated (the client manages his machine at its desire) by providing a virtual machine that uses a portion of server resources (physical) by techniques virtualization (computer).


Most webhosts are paid.There are still some free, most often it is their call for offers for paid services, that are more feature rich and more powerful.
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