What can testing demonstrate?

Testing primarily aims to identify defects in software. By executing a series of test cases designed to explore various aspects of the software, testers can gather evidence regarding the presence of defects. This is crucial because discovering defects allows developers to address these issues before the software is released, thereby improving the overall quality of the product.

The process of testing ultimately helps in revealing any flaws or issues that might affect the software's performance, functionality, or user experience. While testing can provide a level of assurance about the system's reliability, it cannot guarantee that the software is completely free of defects. Therefore, the ability of testing to demonstrate the presence of defects is a core principle of the software testing process and highlights the purpose of conducting testing activities.