Sometimes, it can be of interest to examine how two variables correlate over time. For example, how people in a social network (e.g., an organization) behave or move over the course of time. However, it can be hard to display multi-dimensional data in a single plot. Instead of including time as an additional dimension and providing stakeholders with complicated 3-D plots, ggplot2 now has a support package called gganimate, which allows you to create custom GIFs. Particularly helpful when you seek to demonstrate trends over time.
See this recent post by Analytics Vidhya for a tutorial on the implementation.