In simple way to understand Load stress and performance Testing.

Load testing:

Load testing is a test to check the user’s response time, of number of users using any one scenario (single business process) of the same application at the same time.

Stress testing:

This type of testing the application is tested against heavy load such as complex numerical values, large number of inputs, large number of queries etc. which checks for the stress/load the applications can withstand.

Performance testing:

Performance testing is a test to check the user’s response time of number of users using multiple scenarios (multiple business process) of the same application at the same time.