He complete set of all products offered by a firm is called its

The answer to this question is product assortment/mix

Large companies often had different lines of product that target different market segments in order to maximize its profit.

For examples, Apple produced their MAc products to target the laptop market and they also produce Iphone to targets the smartphone markets.

In this case, all applle's MAcs and Iphones series are considered as their product assortmnet/mix