Google has come a long way from being just a search engine. Over the years, the company has built an impressive array of tools, and while some of them are highly specialized, there are some that are worth knowing no matter what you use the web for. Google Images, aka, Google Image Search, is just one of those tools, so if you don't know what it is, or aren't sure how much it can do, here's what you need to know.
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How Search by Image works
Google Images is a web-based product from Google for searching images online. Although it performs the same basic search and results retrieval functions as Google's flagship search engine, it is better understood as a specialized offshoot.
While Google Search produces web pages with text-based content by scanning text-based content directly, Google Images returns image media based on entered keywords, so the process looks a little different under the hood. The main factor in determining which images fill your results page is how closely search terms match image filenames. This alone is usually not enough, so Google Images also relies on contextual information based on text on the same page as an image.
As a final ingredient, the algorithm leverages primitive machine learning, where Google Images learns to associate certain images with each other to create clusters, to provide its reverse image search feature.
