Web hosting comes mainly in 2 types: dedicated and shared. With dedicated hosting, a company pays all of the resources of one or more servers from a service provider. The client has full control over the servers resources, but also has a set amount of dedicated bandwidth, CPU, RAM, and drive space. Shared hosting is where the client pays for a small amount of space on a single server, and that server's resources are pretty much shared by others as well.
Cloud hosting offers more than web hosting can. With cloud hosting, you pay as you go for whatever space you use (usually) , instead of buying a specific amount of space beforehand. Cloud hosting also is much of a safer bet because the load is pretty much spread across servers. So if a server goes down, there is really no info lost or any downtime.
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Cloud hosting allows unlimited number of machines to act as one system. Other hosting solutions (shared or dedicated) depend on one machine only, while cloud hosting security is guaranteed by many servers. The cloud technology allows easy integration of extra resources, such as space or RAM and thus enable website growth.
Cloud hosting is marketing term and there are still different interpretation of ,that is why I suggest you explore cloud infrastucture term..why?
Well mostly when look for cloud hosting you'll find that mostly it is refered to Virtual Server or sometimes Cloud Server but Cloud Hosting is very wide term and many providers offer regular shared hosting as cloud hosting because their host is on cloud infrastucture.I already say it is marketing term and that is why you'll find many different services offered under same name..but like I say mostly it is refered to VM...so when looking for cloud hosting you should also look for terms IaaS,SaaS,PaaS..because it will tell you much more.
Itís true that Cloud hosting allows unlimited number of machines to act as one system, but it's more costly than shared web hosting and dedicated hosting. In shared and dedicated server, you rely only one physical server with dedicated ram, hard disk and other server hardware. In cloud hosting its being spread on many servers, cloud hosting is more reliable and secure compared to shared and dedicated but one thing that it's always costly.
In our experience, Cloud hosting prevents long outages at the price of more complexity. This complexity can become a point of failure. For instance a bug in CEPH can bring down a whole infrastructure and take a lot of time and expertise to bring back up. With dedicated servers we regularly achieve 100% uptime over a few years and then have a 2 hour outage, with cloud hosting we tend to get more short outages and fewer long ones.
In our experience cloud is good when it needs to be small and flexible (launch a new server in seconds) where as high availability for larger configurations like a big shared hosting server can be better achieved with a less complex cluster with a failover mechanism.
Cloud Hosting in my eyes means that your website is not on one server. Your website is hosted on a system that has been built for fault tolerant/High availability. Often, with cloud hosting you get extra features like dedicated RAM and CPU.
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Web hosting is located on one server, which can belong fully to you, or you may be just one of the users. Cloud hosting is located on several servers. The choice depends on the particular site and your personal preferences.