Trails
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Trails are a common technique in tennis where a piece of footage, usually moving about, creates a 'trail' of itself following close behind. There are many, many different ways this can be done, each of them with unique flavor and flair.
2D Trails
swop swop swop fjaspdfiajspfiahsdfp
3D Trails
A 3D Trail is a trail that moves in 3D space. The footage often remains a 2D plane, however it can also be 3D itself (which is also very resource-intensive!), which when done is often known as a 4D Trail.
Creating a 3D trail is similar in process to a 2D one, however you now have to repeat the layer through 3D space. As a result, 2D effects like echos will no longer work, and you must do it manually.
...unless you have After Effects and the Trapcode Echospace plugin, which can create 3D trails for you with the click of a button. They still are built layer by layer, but you can apply any offset you can think of (position, time, etc.) This saves a ton of time!