Answers
Checking a phone case fits popular phone models
Improving a prototype before launch
Reading reviews from past buyers
Seeing what rival businesses offer
Seeing if a new app works with existing devices
Spotting trends in what is popular
Choosing which customer segment to target
Lowering the chance of the business failing
Finding items often bought alongside yours
Refining a recipe before release
Choosing where to advertise
Avoiding losing money on an unpopular launch
Matching printer ink to popular printer brands
Collecting feedback on what buyers like and dislike
Avoiding buying stock that nobody will buy
Choosing the best location to open
Learning what problems buyers face
Choosing what price to charge
Designing new features for an item
Adapting a design after early testing
Asking shoppers about their opinions
Measuring how big the market is
Finding out who the competitors are