Why Cassandra is column based?

Related questions

1. Is Cassandra a relational database?
2. Is Cassandra a wide column store?
3. Is Mongodb hard to learn?
4. What is tombstone in Cassandra?
5. How does update work in Cassandra?
6. Does Cassandra use consistent hashing?
7. What is compaction in Cassandra?
8. What is Cassandra CQL?
9. What is eventual consistency in Cassandra?
10. What is Gc grace period in Cassandra?

Tags

1. #multiple
2. #cassandra
3. #distribute
4. #matter
5. #stored
6. #partitioning
7. #application
8. #relational
9. #store
10. #columnar
11. #columns
12. #across
13. #organizes
14. #column
15. #transparent
16. #machines
17. #databases
18. #means
19. #oriented