Power Virtual Agents is a cloud-based service that allows users to create chatbots without needing extensive coding knowledge. These chatbots can engage with customers, answer questions, and provide support across various platforms, including websites and messaging apps. The service is part of the Microsoft Power Platform, which integrates with other tools like Power Automate and Power Apps. This integration enables users to automate workflows and enhance the functionality of their chatbots, making it easier to address customer needs efficiently.