Amazon Elastic Compute Cloud (Amazon EC2) What is AWS EC2 ? Amazon Elastic Compute Cloud, EC2 is a web service from Amazon that provides resizable compute services in the cloud. What do you mean by resizable in AWS EC2 ? You can quickly scale up or scale down the number of server instance you are using based upon on your traffic. What is called as Instance? An instance is a virtual server for running applications on Amazon’s EC2. Simply Virtual Machine is called as Instance(i.e)it holds the HDD, OS, RAM, Network Connection Whatever things that are need to run a system. Note : Everything is Virtual You can’t able to see the HDD, RAM , or CPU. Only thing is you can able to configure it based on your need. So here is the Definition…. Amazon Elastic Compute Cloud (Amazon EC2) is a web service that provides secure, resizable compute capacity in the cloud. It is designed to make web-scale cloud computing easier for developers. Why Amazon EC2 ? Pay-as-you