text: **Fundamentals**
  
  In DynamoDB,*tables*,*items*, and*attributes*are the core components. Data items stored in tables 
  are identiﬁed with a*primary key*, which can be a simple*partition hash key*or a composite of a 
  
  partition key and a sort key. Although these terms may sound familiar, we will deﬁne all of them to 
  
  clarify how similar and diﬀerent they are from traditional SQL database terms. 