title: Is it possible to insert/write data without defining columns in Cassandra?
body: <p>I am trying to understand the fundamentals of Cassandra data model. I am using CQL. As per I know the schema must be defined before anyone can insert into new columns. If someone needs to add any column can use ALTER TABLE and can INSERT value to that new column.</p>
  
  <p>But in cassandra definitive guide there is written that Cassandra is schema less. </p>
  
  <pre>
  In Cassandra, you don’t define the columns up front; you just define the column
  families you want in the keyspace, and then you can start writing data without defining
  the columns anywhere. That’s because in Cassandra, all of a column’s names are
  supplied by the client.
  </pre>
  
  <p>I am getting confused and not finding any expected answer. Can someone please explain it to me or tell me if I am missing somthing? </p>
  
  <p>Thanks in advance.</p>