title: What's the difference between EC2 Community AMIs and Marketplace AMIs
body: <p>Ubuntu certify their Cloud image as ami-f95ef58a, and it's available as a Community AMI in region eu-west-1.  See Ubuntu documentation <a href="https://cloud-images.ubuntu.com/releases/14.04/release-20160114.5/" rel="noreferrer">here</a></p>
  
  <p>Centos on the other hand publish their official AMI in AWS Marketplace with a cost of zero.  See Centos documentation <a href="https://wiki.centos.org/Cloud/AWS" rel="noreferrer">here</a>.</p>
  
  <p>In both cases there is no charge.</p>
  
  <p>So I am left confused about the difference Amazon intend us to care about between Community and Marketplace?</p>