Slope charts are used to compare values between two points in time or across two conditions. Each line connects two values on opposite vertical axes, and the slope indicates the direction and magnitude of the change. It is especially useful when you want to highlight shifts in rankings or values, without plotting a full timeline.
A practical example is comparing the pre- and post-campaign engagement of different content categories. A slope chart will show which categories improved, remained stable, or declined. It is often used in storytelling and presentations where focus is on the relative movement between states, such as before-and-after scenarios in business strategy, rankings, or policy impact.