What is the primary function of the Web Collect tool in Marketing Cloud?

The primary function of the Web Collect tool in Marketing Cloud is to gather subscriber profile information. This tool is especially useful for creating forms through which users can submit their details, such as email addresses, preferences, and other relevant information. By using Web Collect, marketers can easily collect and manage data about their subscribers directly from web pages. This is crucial for building targeted marketing campaigns and ensuring that subscriber lists are updated with accurate and relevant information.

The other options, while related to marketing functions, do not align with the specific capabilities of the Web Collect tool. Segmenting subscribers typically involves analysis of existing data to categorize them based on various criteria. Creating custom reports is a function handled by reporting tools within Marketing Cloud that analyze data after it’s collected. Managing email deliverability focuses on ensuring that emails reach the intended inboxes, which involves technical aspects like authentication and understanding sender reputation, rather than data collection. Thus, the correct answer highlights the tool's main capability to facilitate the collection of subscriber data.