Let's say you log into your amazon or eBay account and start searching for a gift clothing. First you would filter out gender-specific collections, then you might fix a particular color or even a set of colors of your choice, and following that, you can fix a price range. When you apply these filters one by one, you can see the aggregate products displayed each time varies (their total number changing according to the availability of aggregates). This is exactly what aggregations do.

Imagine being able to mimic a celebrity’s look with a screenshot. Users could use the image to quickly find clothing sold online that matches the style. But, this is not the search experience of today. Customers struggle to find what they need, and if they can’t, they'll leave. Some of them don't remember the name (keyword) of what they are looking for, but have an idea of what it looks like or the actual image.