This document discusses different sources of big data including media, cloud, web, internet of things, databases, social networks, activity-generated data, and legacy documents. It provides brief descriptions of each source, highlighting how they generate valuable insights. Media such as images, videos and social media provide consumer preference data. Cloud storage accommodates structured and unstructured data to provide real-time insights. The web and internet of things generate machine-generated data from various devices. Databases integrate traditional and modern data sources. Social networks and reviews provide user profile and influencer data. Activity logs also contribute to big data. Legacy documents remain an untapped resource.