In this AWS Cost Optimization Series video, Jenny Vega introduces AWS Cost Explorer, a powerful tool for analyzing and managing cloud costs. She demonstrates how to access and use Cost Explorer through the AWS Management Console, explaining its features such as cost summaries, detailed reports, and customizable graphs. Vega shows how to filter data by various parameters like services, linked accounts, and time periods, enabling users to gain insights into their AWS spending patterns and identify areas for potential savings. The video provides a practical walkthrough of Cost Explorer's interface, making it a valuable resource for AWS users looking to optimize their cloud expenditure.