> ## Documentation Index > Fetch the complete documentation index at: https://messenger-docs.cogfy.com/llms.txt > Use this file to discover all available pages before exploring further. # Overview > Learn about Cogfy Engines and how to manage them An engine is a core component that powers how Cogfy Messenger handles messages, makes decitions, takes actions and generates replies in a step-by-step, decision-tree fashion, as you can see below. Screenshot of an Engine's workflow. If you didn't guess already, don't worry: we'll explain all of this in more detail in the following sections of this guide, as well as how to create and "publish" engines so they can be used in your workspace. ## Creating To create your first engine, go to the "Engines" section in the sidebar and click on the "Create" button. A new engine will be instantly created. ## Setting on a phone number In order to use an engine to handle incoming messages, you need **publish** it to a phone number. For that, select a phone number from the top of the sidebar, then click the ellipsis icon and select "Publish Engine". After publishing, all incoming messages to that phone number will be handled by the selected engine instead of the default assistant rules handler.