What is the difference between Load and Stress testing?

Load Testing is the process of measuring the performance of the application under specific expected user load. load Test is conducted to understand the application behavior trying to achieve expected Transactions within specified time with expected concurrent number of users.

Stress Testing is done to check the performance of the application under extreme load. This kind of testing is done to determine how the system will behave when more than the expected load is applied to the system and whether  the application can achieve more than the expected transactions within a specific duration.

Example :

If an application is built for500 users, then for load testing we check up to500 concurrent users and for stress testing we check the application behavior beyond500 users.

Load testing is in full charge, and stress test is for a long period of time.