Portent, Inc. is a Seattle-based digital marketing agency specializing in various aspects of internet marketing, including SEO, content strategy, and analytics, with a vision to be a leading partner in driving client success. The document explains the concept of marketing personas, emphasizing their importance in understanding target customers through demographic and behavioral characteristics. It provides guidelines for creating effective personas, including the use of analytics and keywords, and illustrates the process with an example of a gluten-free food customer.