Final answer:
Demographic filtering is a technique used in business to augment click-stream data and user-supplied data with demographic information associated with user zip codes for personalized product suggestions.
Step-by-step explanation:
Demographic filtering is a technique used in business to enhance click-stream data and user-supplied data with demographic information associated with user zip codes. By incorporating demographic information such as age, gender, race, and socio-economic status, businesses can make targeted product suggestions. This method helps in understanding customer preferences and tailoring product recommendations based on demographics.