What is the difference between Load testing and Performace Testing?

The concept and exercise of Load testing is after the performance testing.

Performance testing is something where we find the response time of the appication, look out the Bootlenecks & Tune it. This testing includes in different layers Like Application Layer, Network Layer, Database Layer & OS Layer. After fixing the defects from the Above layers then comes an exercise to perform a Load Testing.

Load testing is done once if the functional and Performance testing is up and done to check the minumum and maximum load the Application can handle.