Final answer:
Cinematch develops a map of user ratings and steers users toward titles preferred by people with tastes that are most like theirs in Netflix.
Step-by-step explanation:
The role of Cinematch in Netflix is that it develops a map of user ratings and steers users toward titles preferred by people with tastes that are most like theirs. This helps to personalize the viewing experience for each user and recommend content that they are likely to enjoy based on their previous ratings and preferences. Cinematch uses algorithms and data analysis to determine similarities between users and make accurate recommendations.