The product manager's personal preferences are subjective and should not influence product planning. Instead, focus on customer needs, market trends, and competitor strategies, which are essential for successful product development.

A product line refers to a series of similar products marketed under a single brand, allowing companies to offer a variety of options within a specific category, enhancing brand identity and customer choice.

In advertising, 'reach' refers to the number of people exposed to an ad. It measures the potential audience size, making it crucial for assessing the ad's visibility and impact.

Twitter is a leading platform for social media advertising, allowing businesses to target specific audiences effectively. Unlike traditional media like newspapers or radio, Twitter offers real-time engagement and analytics.

The correct choice, 'Advertisers pay only for results', highlights a key advantage of PPC advertising, as advertisers incur costs only when users click on their ads, ensuring they pay for actual engagement.

A key disadvantage of PPC advertising is that it requires constant monitoring to optimize performance and budget. Without regular oversight, campaigns can underperform or overspend, making this a significant drawback.

The primary goal of product development is to create a product that meets customer needs. This ensures customer satisfaction and drives market success, making it essential to focus on what customers want rather than other factors.