This module allows customers to compare 2 or more products in the same time to make the decision to purchase the products. If you wanted customers to compare televisions, you might have attributes like Manufacturer and Screen Size. If you make these attributes Comparable on Front-end: Yes customers will be able to view the televisions side by side and make an educated shopping decision.
This is very powerful - if customers desire, they can compare a chair, a television, and a pair of running shoes. The attributes these products have in common are most likely only things like SKU, Price, and Product Name. Let’s say the chair has a comparable attribute called Material: Wood. For the other two products it will simply read Material: - . On the other hand, the television might have a comparable attribute called Screen Size: 25”, which would show as Screen Size: - on the other two products.