A customer likes an outfit. It is styled so well. A customer can click a picture of this outfit on the phone. An e-commerce app can search the entire catalogue using this image for the customer. A customer need not describe the outfit in textual inputs. A customer can like a colour or pattern. He wants to be shown a similar kind of product. Flipkart, YepMe, CraftsVilla and Voonik has launched this image search feature. To recognise images and show similar results, companies use computer vision. It is an upcoming discipline that uses computer power to give computers an ability to recognise images. Google, Fb and MS — all of them have invested in computer vision. Visual search is advantageous while selling for fashion. Mad Street Den, a start up in this field, which is Chennai-based has developed technology that analyses an image for colour, pattern and other attributes visually, and pulls up clothes similar to the ones being viewed by the user. In short, computer vision is a component of AI. To make this work, large computer networks known as deep neural networks are trained using a set of images.