Software Testing is defined as an activity to check whether the actual results match the expected results and to ensure that the software system is Defect free. It involves the execution of a software component or system component to evaluate one or more properties of interest. Software testing also helps to identify errors, gaps, or missing requirements in contrast to the actual requirements. It can be either done manually or using automated tools. Some prefer saying Software testing as a White Box and Black Box Testing.
You can use a platform like QAppAssure which allows you to test on-cloud and on-field devices, across 100+ device, make and models, Integrate with Jira, CI/CD tools, and also use Appium, Calabash, Espresso, UIAutomator, XCUITest. You can run unlimited parallel tests with the free trial pack.