Q. Which product types exist in Magento? - Magento has 6 standard product types, including: Simple product, grouped product, configurable product, virtual product, bundle product and downloadable product.
Q. Which product types are implemented as part of the Mage_Catalog module, and which are not?
Mage_Catalog – simple, grouped, configurable, virtual
Mage_Bundle – bundle
Mage_Downloadable – downloadable