Column Store: The entries of a column are stored in contiguous memory locations in which tables are using for Analytic purpose like Dimension, Cubes, because for grouping and column functions.
Row Store:In row-order, table data is stored as a sequence of records. It is actually OLTP purpose and like common RDBS tables for the purpose of OTLP transactions.
In Traditional Computing you use the Row store
In HANA - In Memory Computing,
95% Column Store.
5% Row Store.