title: Amazon SimpleDB vs Amazon DynamoDB
body: <p>I have some basic understanding what <a href="http://aws.amazon.com/simpledb/" rel="noreferrer">Amazon SimpleDB</a> is, but according to the <a href="http://aws.amazon.com/dynamodb/" rel="noreferrer">Amazon DynamoDB</a> description it seems to be almost the same: a <a href="http://en.wikipedia.org/wiki/NoSQL#Key-value_store" rel="noreferrer">NoSQL Key-value store</a> service.</p>
  
  <p>Can someone simply explain the <strong>main differences</strong> between them and tell in which cases to choose <strong>one over the other</strong>.</p>