Difference between Shared, VPS, and Dedicated Hosting

Shared Hosting
 Shared Hosting is very similar to living in an Apartment Complex. All residents are in the same location and must share the available resources with everyone - such as the pool, parking lot, and play ground. In shared hosting, all accounts (sites) must share the available resources with all the other accounts on the server - such as CPU time, memory, and disk space.

VPS Hosting
 VPS Hosting is similar to owning a Condo. While you still share things on the property, you are ultimately responsible for maintaining your own property and repairs inside the condo. There is also significantly less residents per building and assigned parking. On a Virtual Private Server, you are allotted resources that are not shared by everyone. The over all CPU time and memory are shared across all accounts on the machine, but at the same time portions of those resources are always dedicated to each account. This allows for more power and flexibility than being on a shared account. 

Dedicated Hosting
 Dedicated Hosting can be compared to owning a house. You are allowed and have access to all resources available on the machine. No one else's account resides on the machine (your house) and would not be capable of tapping into your resources.

Now that you know a little bit more about hosting, which is right for you? A VPS or dedicated server?
  

Comparison between VPS and Dedicated server 

Hardware

VPS

You are still sharing server hardware with other users. However, you server is virtualized which means it runs as though it is on a dedicated server. That means you can restart services, make modifications to server files, and create other user hosting accounts.

Dedicated

You are on your own here. The entire server is yours to play with. That means all the hardware specs (CPU, RAM, data transfer, etc.) are yours. Also, you can have more flexibility with hardware setups. For example, need an extra 500GB of storage? Then this could added by the support team for an additional fee.

Software

VPS

You are free to install whatever program you want. However, if it starts pulling on resources and starts pulling resources from other VPS customers, then this could be an issue and cause your website performance to slow or become suspended for abuse.

Dedicated

Regardless of how your software programs perform, you are free to install any programs you please. A high resource program will not affect others expcept for any clients you are managing.

Budget

VPS

Given the hardware specs and freedom you get on a VPS, the performance boost on a VPS is more budget friendly.

Dedicated

More expensive than VPS hosting because you do get your own server and better specs.

cPanel VS Plesk - Which one is right for your dedicated server?

cPanel VS Plesk. Which control panel is right for your dedicated server?
There are a number of control panel options available to choose from for your dedicated server. Two of the most popular of these options are cPanel and Plesk. Choosing the right control panel for your dedicated server can sometimes be a difficult decision as there are a number of points to consider. While both control panels offer a lot of the same options, there are some differences that should be noted before deciding which one to use. First, let's learn a bit about the history of each company.
cPanel History
Since 1997, cPanel has been providing software packages to automate server tasks for web hosts and website owners. cPanel is a Linux based control panel system that utilizes a GUI (Graphical User Interface) to simplify and automate a lot of the functions needed to host a website.
Plesk History
Plesk (Parallels Plesk Panel), originally Plesk Inc., was originally started in the US and purchased by SWSoft in 2003. SWSoft changed their name in 2008 to Parallels, where you will still find them today. The Plesk control panel is compatible with both Windows and Linux server platforms which has helped them in positioning themselves at the top of the list for reliable control panel software providers in the world.
What are the system requirements for cPanel & Plesk?
It is very important to ensure you have the appropriate resources allocated to your server before choosing the control panel software as both cPanel and Plesk have their own requirements. Speak with your service provider to find out which control panel options they offer as some do not offer both.
cPanel Requirements

• Processor: 266MHz processor
• Memory: 512MB RAM (1GB is recommended when hosting a large number of websites)
• Disk Space: 10GB hard disk

Plesk for Linux Requirements

• Memory: 512MB RAM (1 GB when hosting many accounts; 768MB minimum when also using Web Presence Builder)
• Disk Space: 10GB hard disk

Plesk for Windows Requirements

• Memory: 1 GB of RAM (2 GB when hosting many accounts)
• Disk Space: 32GB hard disk

Which Operating Systems are supported?
As previously mentioned, cPanel is a Linux based control panel while Plesk offers installation options on both Linux and Windows servers. cPanel does offer a secondary control panel called Enkompass which can be installed on Windows servers. Below is a list of the supported operating systems for both control panels.
cPanel

• CentOS versions 4.x, 5.x, 6.x
• Red Hat Enterprise Linux versions 4.x, 5.x, 6.x
• CloudLinux 5.x, 6.x

Enkompass

• Windows Server 2008
• Windows Server 2008 R2, Web, Standard Data Center
• Enterprise Edition

Plesk
Linux

• CentOS versions 5.x, 6.x
• Red Hat Enterprise Linux versions 5.x, 6.x
• CloudLinux versions 5.x, 6.x
• Debian 6.0
• openSUSE versions 11.4, 12.1
• Ubuntu versions 10.04, 12.04 Server LTS

Windows

• Windows Server 2008 R2 SP1
• Windows Server 2008 R2
• Windows Server 2008 SP2

Supported Virtual Environments
cPanel lists a number of supported virtual environments that are compatible with their control panel, which include:

• KVM
• Linux-VServer
• Microsoft Server 2008 Hyper-V
• OpenVZ
• Oracle VM VirtualBox, VirtualBox OSE
• Virtuozzo
• VMware Server, VMware ESX Server
• Xen, XenEnterprise, XenExpress, ZenSErver

Which control panel is more popular?
cPanel currently tops the market share of control panel installations around the world. We strongly recommend to customers to have CentOS 6 and cPanel installed on their servers as we find cPanel is easier for clients to manage and they provide excellent technical support. There are also a number of additional features, including:

• One-Click software installations (Softaculous)
• Easily updated software
• Fast loading times
• 3 tier user setup (root, reseller and user)
• and more

Are there licensing fees for these control panels?
There are monthly licensing fees for both cPanel and Plesk, but these vary depending on your service provider. You can typically see a cost of between $24.99 to $49.99 per month for a cPanel license and $39.99 to $59.99 for a Plesk license.
How do I install cPanel or Plesk?
If you are going to install cPanel or Plesk on your own it is important that you familiarize yourself with the full installation instructions prior to starting and contact your service provider to ask any questions you may have first. Below are links to the installation instructions for cPanel and Plesk.
cPanel Installation Instructions
Plesk Installation Instructions
Whether you choose cPanel or Plesk it is important to first do your research. Again, ensure your server has the appropriate resources available and do not be afraid to ask your service provider for assistance. Also, find out if your service provider is an authorized cPanel or Plesk partner as that may help you make the decision of which control panel to choose.

Thanks
R.karthikeyan