The difference between Google and Google image search engine is the option of image upload. you can access this from the following link. Google provides separate URL for image search. How to find slimier images from Google reverse image search
What are the benefits of reverse image search? You can find similar images across the web by entering the image URL or upload an image, or choose an image from your desktop PC, Laptop, and mobile phone or from Google images or Yandex images. This tutorial explains how to find related images using Google and Yandex reverse image
