You know how easy it is to search for just about anything online. You go to Google, Bing, or another search engine, and type in what you're looking for.
These days, you don't even need to type; you can use voice-activated assistants like Apple's Siri to find information for you. Or, you can scan a QR code, or input an image, and your search engine will share a list of everything it finds related to your search.
One of those image-input search engines is called TinEye. It finds images online by first creating a fingerprint-type image of a photograph. With fingerprints, legal authorities find tiny points on them that make them distinct from other prints.
TinEye finds similarly unique points on photographs or images. Then, it searches for exact matches to those points in its ever-expanding database of billions of images. (See example below of Kim Komando.)
There are many uses for image-recognition software. If you own a company, you probably want to make sure other companies aren't using your logos or product images, especially if you've paid people to create those logos and images for you. To protect your investment, conduct a search of your images, to make sure no one else is using them.