A heat map is a visual overlay on a store floor plan that uses colour to show how much activity each area receives. Warm colours such as red and orange mark busy places where people walk or linger, while cool colours such as blue mark areas that few people visit.
The data behind a heat map comes from overhead sensors or cameras that track anonymous movement across the floor. The software divides the store into small cells, adds up the presence or dwell time in each, and renders the totals as colour. Reports can be filtered by day, hour or campaign, and compared between two periods.
Retailers use heat maps to judge layout and merchandising. Cold corners may suggest that a product category is hard to find or that a display is badly placed, while hot spots show where shoppers naturally gather. Teams compare maps before and after moving fixtures, changing a window or launching a promotion, to see whether behaviour changed.
A heat map should be treated as a prompt, not an answer. A hot area can mean interest, or it can mean a bottleneck. A cold area may be intentionally quiet, such as a stockroom path. Maps are most useful when combined with sales by zone and conversion data, and when sensor coverage is complete, since blind spots appear as cold areas.
Heat maps matter because they make movement visible to people who are not data specialists. A manager can see in seconds where customers go, which supports practical layout decisions without relying on guesswork or memory.