title: Is Cassandra a Key value store or wide column store?
body: <p>I'm preparing a course on NoSQL for database novices. Did a lot of research online and now, I'm in a dilemma as to categorize Cassandra as a Wide Column Store or a Key Value Store? Or shall I call it a two dimensional Key Value Store? I'm having the same issue with CouchBase. Is it a Key Value store or a Document Store? </p>
  
  <p>I'm looking for a Solid way to categorize NoSQL Databases in their versions in 2015. Any help is appreciated. </p>