This lesson introduces learners to the various types of data sources that power AI and Machine Learning systems. It covers structured, semi-structured, and unstructured data, along with common sources such as databases, APIs, sensors, and online repositories. Learners will explore how data is collected and stored, and why the quality and origin of data significantly impact model performance. By the end of this lesson, learners will have a foundational understanding of how to identify and evaluate appropriate data sources for AI applications.