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A review aggregator is a system that collects reviews of products and services (such as films, books, video games, software, hardware and cars). This system stores the reviews and uses them for purposes such as supporting a
Review aggregation sites have begun to have economic effects on the companies that create or manufacture items under review, especially in certain categories such as electronic games, which are expensive to purchase. Some companies have tied royalty payment rates and employee bonuses to aggregate scores, and stock prices have been seen to reflect ratings, as related to potential sales. It is widely accepted in the literature that there is a strong correlation between sales and aggregated scores. Due to the influence reviews have over sales decisions, manufacturers are often interested in measuring these reviews for their own products. This is often done using a business-facing product review aggregator.