Microsoft's unified hub of tools for discovering, assessing, and migrating on-premises or other-cloud servers, databases, web apps, and VMs into Azure. It includes dependency assessment, target sizing, and cost estimation.
On AZ-305 this is the starting-point tool for any migration project: you first use Azure Migrate to discover the current state and plan the strategy (the conceptual equivalent of the AWS 7 Rs), then execute the migration with the specific associated tools.
Azure Migrate is a concept that can show up on the exam. Check the full guide to see it in context.