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In ComfyUI, the lines or curves drawn between nodes are called links (also referred to as connections or wires). They carry data from one node’s output to another node’s input, defining the flow of your workflow. Links can be displayed in several visual styles: curves, right angles, straight lines, or hidden entirely. To change the link style, go to Setup Menu → Display (Lite Graph) → Graph → Link Render Mode. You can also temporarily hide all links from the Canvas Menu.
Showing links is especially useful when learning, sharing, or debugging a workflow — they make the data flow visible at a glance. For finished workflows that aren’t meant to be edited, hiding links can reduce visual clutter.

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Reroute node

When a workflow becomes complex, link wires can overlap or pass behind nodes, making it hard to read. The Reroute node lets you manually redirect a wire through any point in the 2D graph space, keeping the layout clean and legible. ComfyUI also has a built-in native reroute feature in the graph canvas. We recommend using this for new workflows.

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Color-coding

Every data type in ComfyUI has a distinct color. Node input and output ports, as well as the link wires connecting them, all share this color scheme. You can only connect ports of the same color — this ensures type safety across your workflow.