Application- own Uninstaller feature

How and where can you find or know if an application has it's own uninstaller? Sometimes when I download a program and find I don't like it I just drag it into trash or use appzapper. But where do you see if a program has it's own uninstaller which would be the preferred way of doing it? How can you tell? In windows I knew where to look, in Mac I don't.
Thanks for a reply.

If it had one, it would probably install the application inside a folder (within the Application folder itself). For example, Flip4Mac actually creates a folder, and in that folder is an uninstaller.

Okay Thyamine, thanks for the reply. I checked inside flip4Mac and I noticed the uninstaller in there. So in other words before trashing an app I should just look for the uninstaller in the program itself. Thanks again for the insight.

Yep. 75% of apps go straight in the trash (the icons are really folders that you don't have access to by default). The others should have an uninstaller.