Why many refer to Cassandra as a Column oriented database?

Question

Reading several papers and documents on internet, I found many contradictory information about the Cassandra data model. There are many which identify it as a column oriente

Answer 1

Column Family does not mean it is column-oriented. Cassandra is column family but not column-oriented. It stores the row with all its column families together.

Hbase is column family as well as stores column families in column-oriented fashion. Different column families are stored separately in a node or they can even reside in different node.