I like Roy's analogy about the difference between unit and integration testing: Unit testing vs. Integration Testing : The Restaurant Analogy.
I like Roy's analogy about the difference between unit and integration testing: Unit testing vs. Integration Testing : The Restaurant Analogy.
Unit testing is having one free, tasty appetizer.
Integration testing is having several different good meals (with different combinations of appetizer, entree and dessert) with different people AND checking the health department report.