Both single-machine and cloud-based VPSes are managed using a software program called a hypervisor. The machine that runs the hypervisor is called the host machine and the individual virtual private servers are called guest machines or guest instances. The hypervisor can start and stop the virtual machines and allocates system resources, such as CPU, memory, and disk storage to each VPS.
If you are not already familiar with Linux system administration, you will need to devote a great deal of time to familiarizing yourself with all of the applications you're using and the CentOS operating system - you could pay someone else to set up your VPS for you, but that wouldn't help down the road when you need to update software and resolve administrative issues... (if you're not sure, go with a managed service)
The primary disadvantage to using a VPS is its lack of performance. The organization that provides the VPS will typically throttle the server's performance in an effort to maximize the number of VPSs that the physical server is able to accommodate. In the unlikely event that the VPS's performance is not throttled, it then becomes possible for an adjacent VPS to consume excessive resources, to the point of impacting the VPS's performance.
You can host a basic web application, such as a blog or simple website in a VPC, and gain the additional layers of privacy and security afforded by Amazon VPC. You can help secure the website by creating security group rules which allow the webserver to respond to inbound HTTP and SSL requests from the Internet while simultaneously prohibiting the webserver from initiating outbound connections to the Internet. You can create a VPC that supports this use case by selecting "VPC with a Single Public Subnet Only" from the Amazon VPC console wizard.
InMotion Hosting is #1 in transfers for a reason. That's because we offer all the tools, speed, and security someone may need - and more. Our AutoSSL feature, powered by cPanel and Comodo, allows you to issue SNI SSLs for each and every website you host with us. Enable auto-renewal to have peace of mind knowing your websites stay secure for your visitors. Our VPS servers are also fully compatible with Let's Encrypt, although you'll have to install and manage it independently.