These two testing types fall under performance testing and software testing. One is to check if the software or the product is working fine under various circumstances, while the other help verifies the reliability and stability factor of a system. Load Testing falls under the performance testing category, where the system’s performance gets assessed under real-life circumstances. For example, the testers check how the software under question would behave under high network traffic and under real-life scenarios. The table below states the fundamental differences between the two. Load Testing Stress Testing It is a set of instructions used to verify how the system handles heavy loads and determine its upper limit. Based on this information, the system’s service level agreement gets to sit. It is a testing technique that helps determine the system's behaviour under pressure and its recovering power. It involves running the system through a huge volume of people. It involves running through too many users and large volumes of data. Performance is the primary factor that gets tested through this testing method. The reliability and robustness of the system get checked through stress testing. It helps determine the operating capacity of the system or application. It helps determine the system's behaviour when you put it under stress or unfavourable circumstances. You can evaluate the system’s maximum capacity value with load testing. You get to evaluate the system security aspect with stress testing.