The most obvious difference between 2D and 3D is in the name
2D means two-dimensional and 3D means three-dimensional. In other words, a 2D animation has flat images that lack depth and can only move vertically and horizontally.
Your 2D animated video
A 2D animated video is well suited for explaining how something works, such as an organization or service. One advantage is the ability to insert completely different objects to explain things.
Another benefit with animated video is that it can have a long life. In a recorded video, there may be machines that gets old or personnel who have been replaced.
With an animated video, it is also easier to make a video that is lighter and with a bit of humor. Then it becomes easier to get the viewer to stay there to take part in the whole message.