The main difference is capacity and image quality. DVDs have a capacity of up to 4.7 GB, with a resolution of up to 720x480 pixels, while Blu-ray discs can store up to 50 GB of data and play videos in up to 1080p or 4K resolution.
What is upscaling and how does it work on a Blu-ray player?
Upscaling is the process that upgrades the resolution of a DVD (or lower resolution Blu-ray) to a higher resolution such as 1080p or 4K. So older movies can appear sharper on modern high definition TVs.
