It started out as Project Felix on March 28, 2017, and became Dimension on October 18, 2017. Unlike other modeling programs such as SketchUp, models are not created in Dimension. Instead, it is a photo-based mockup editor where models, photos and textures need to be created in third party software before being imported into Dimension. Once in Dimension, models and images can be composed into arrangements before being rendered to 2D photo realistic images.
Originally relying on the V-Ray rendering engine, in April 2019 Adobe switched to its own 3D rendering engine called Adobe Rendering Engine (ARE) with the release of Dimension CC2.2, and stated that support for external rendering engines may be considered in the future.
Contrary to popular belief, Adobe had a similar program called Adobe Dimensions back in 1993, which specialized in 3D-dimensional artwork. It only lasted a few years of support and had garnered lower sales compared to Illustrator/Photoshop, and it was discontinued quickly.