Smoke testing is the initial testing process exercised to check whether the software under test is ready/stable for further testing.
The term ‘Smoke Testing’ is came from the hardware testing, in the hardware testing initial pass is done to check if it did not catch the fire or smoked in the initial switch on.
Prior to start Smoke testing few test cases need to created once to use for smoke testing. These test cases are executed prior to start actual testing to check critical functionalities of the program is working fine. This set of test cases written such a way that all functionality is verified but not in deep. The objective is not to perform exhaustive testing,the tester need check the navigation’s & adding simple things, tester needs to ask simple questions like “Does the program run?”, “Does it open a window?”, or “Does clicking the main button do anything?”