Literally 'reverse search for image' means that you will search with an image instead of words (search terms).
How does that work?
You upload an image from your computer or you paste an image's URL into a program and it searches the internet and compares that image with images on other websites.
You can use Reverse Image Search to:
Some advantages highlighted:
Verify the source of an image
With a reverse image search, you can trace the original source of an image and how the image has changed over time. It is particularly effective for verifying social media profiles, news stories, and event images.
Tracking copyrighted images
Photographers and content creators (for example, infographics) can use reverse image search to learn how their content is being used on the web. Creating your own images can help you track who is using your images, decide whether reuse is legal and appropriate, and whether or not to take action (you can have them removed or send an invoice).
Find similar images
Can help you find better photos or options for an image.
TinEye is the pioneer in the field of image tracking since 2008.
Users can upload an image to the site or provide the URL of the image and the site will find similar images from the more than 44 billion image repository.
Since 2011, Google offers its users the option of locating images.