The purpose of load testing is to evaluate the application’s performance under increasingly high numbers of users. Load, or increasing numbers of users are applied to the application under test and the results are measured to validate the requirements are met.
This load can be the expected concurrent number of users on the application performing a specific number of transactions within the set duration. This test will give out the response times of all the important business critical transactions. If the database, application server, etc. are also monitored, then this simple test can itself point towards bottlenecks in the application software.