3DVD was a Disc that held 3D IMAX movies.
Origins and Purpose
It was created as an effort to revitalize DVD sales and to compete directly with 4K. A smaller form factor was created so that it could fit into a new slot on smartphones. Yes, basically it was a small DVD that you could load into a smartphone!
The 3D DVD was launched around December 2017 and grew in popularity between the years of 2018 and 2019.
The 3DVD was the last new disc format. After the 3DVD lost popularity in 2020 major corporations started discontinuing the product.