Every chart you have made so far is dead. You save it as a PNG. You look at it. You wonder what that one outlier point is. You squint at the axis. You cannot zoom in. You cannot click anything. You cannot hover to see exact values. You make a new chart with different settings. Save again. Look again. This loop is fine for quick exploration. It becomes painful when you have a complex dataset with thousands of points and patterns hiding at every zoom level. Plotly makes charts that are alive. Hove