Amazon EC2 provides scalable Computing Capacity in the AWS Cloud You can use amazon EC2 to launch as many or as few Virtual servers as you need, Configure security and networking and manage storage. Amazon EC2 enables you to scale up or scale down the instances Amazon EC2 is having two storage options , i,e. EBS & instance store Pre Configured templates are avaliable known as Amazon Machine Image By default, when you create an EC2 account with amazon, your account is limited to a maximum of 20 instances per EC2 Region with two default High I/O instances.
Types of EC2 Instances:
General Purpose: balanced memory & CPU
Compute Optimzed: More CPU than RAM
Memory Optimzed: More RAM
Accelerated Computing/GPU: Graphics Optimized
Storage Optimized: Low Latency
High Memory Optimized: High RAM, Nitro system.