AMAZON ELASTIC COMPUTE CLOUD (EC2)

What is EC2 Instance ?

An EC2 instance is a virtual server in the AWS Cloud.Amazon Elastic Compute Cloud (Amazon EC2) provides on-demand, scalable computing capacity in the Amazon Web Services (AWS) Cloud. 

The name itself explains its core value:
    Elastic: You can easily increase or decrease the number of instances or their size as your needs change.
    Compute: It provides the processing power, memory, and storage for your workloads.
    Cloud: It runs on AWS's massive, global data center infrastructure.

FEATURES OF EC2

Amazon Machine Images (AMIs)
    Pre configured templates for your instances that package the components you need for your server (including the operating system and additional software).

Instance types
    Instance type is a hardware profiles of your virtual server. Various configurations of CPU, memory, storage, networking capacity, and graphics hardware for your instances. Each instance type offers a different balance of compute, memory, network, and storage resources. see more

Key pairs
   Secure login information for your instances. AWS stores the public key and you store the private key in a secure place.

Security groups
    A virtual firewall that allows you to specify the protocols, ports, and source IP ranges that can reach your instances, and the destination IP ranges to which your instances can connect.

AMAZON EC2 PRICING

  

EC2 instance is pricing in 5 different ways they are. 

On-demand                -   Pay only for what you use
Spot instances           -  discounted short-term capacity if available
Savings Plans            -   commitment to a certain amount of usage
Reserved Instances -   discounted reserved long-term capacity
Dedicated Hosts       -   Physical servers dedicated to a single customer
  

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