Elastic Compute Cloud is the primary “cloud” product when talking about AWS.

• Instance = virtual machine
• Reserved instance = it's a normal instance, except you're dedicating to a certain amount of usage. This can be cheaper than a standard instance which is pay-as-you-go.
• Dedicated host = it's a physical host dedicated for you to spin up instances on.

TODO

To connect to a Linux instance, you're going to need to have a PEM key attached. This key can be converted to other formats but the default format is PEM.