A web hosting service is a type of Internet hosting service that allows individuals
and organizations to host their own website accessible via the World Wide Web. they are the companies that provide space on a web server as well as providing Internet connectivity. It allows your website to be assessable on the Internet 24 hours a day, 365 days a year. The website itself is being hosted on a web server most often located in a specialized data center. Using this service lets many companies share the cost of a fast Internet connection for serving files.
Hosting uptime refers to the percentage of time the host is accessible via the internet. Many web hosting providers state that they aim for 99.9% uptime (roughly equivalent to 45 minutes of downtime a month, or less), but there may be server restarts and planned (or unplanned) maintenance in any hosting environment, which may or may not be considered part of the official uptime promise.
Linux hosting is for only static web site but Windows hosting is for both static and dynamic websites. I recommend you to use windows hosting rather than linux hosting. never search only for a cheap web hosting. hosting you are going to buy should have best uptime and customer care service.
Dedicated hosting service is the service in which service provider provide a personal server to you. Generally dedicated hosting is for those who are going to setup their own hosting company instead of a personal website plan.