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In Eagle PCB design software, the board outline is the perimeter or boundary of the physical printed circuit board. It defines the shape and size of the board and is used to indicate where the board will be cut or routed during manufacturing. To create a board outline in Eagle, follow these steps: 1. Open or create a new PCB layout file. 2. Click on the "Outline" button in the toolbar on the left side of the screen. 3. Use the "Line" tool to draw the board outline on the top copper layer. 4. If necessary, switch to the bottom copper layer and repeat step 3 to draw the board outline on the bottom layer. 5. Use the "Move" tool to adjust the position and shape of the board outline as needed. 6. Save the PCB layout file. It's important to note that the board outline should not overlap with any other components or traces on the board. The board outline should also include any cutouts or slots required for connectors or other components.