Recommender modul

If customer looking some product and want to buy it, it is good to display after description section, some recommended product for up-selling.
These products can be some spare parts, accessories related to main product, or some other product related some how to main product.
This is very effective way for enchasing sales and to add some more value to your store.
You can call this block also like "Customers who bought that products are bought these to"