Difference between Data Warehouse & Data Mart

DATA WAREHOUSING Focuses enterprise level, With different Subject.
Example : IN LIC
we have loan & Insurance, for both of these if we create Data Warehouse then it is said to be Data Warehousing

DATA MART Focuses singal line of business.

Example : IN LIC
if we create separate Data Warehousing for both these, then it is said to be Data Mart.
Data Mart is sub set of DataWarehosuing