The typical formats of DVD resolution are 720×480 for NTSC countries, and 720×576 for PAL countries. Both of two formats are available in 4:3 and 16:9 aspect ratios. And if you own a Blu-ray player, then plays DVD, it will upgrade the resolution to 720p, meaning the resolution will upgrade to 1280×720.
Note: NTSC is the video system or standard used in North America and most of South America, which transmits 30 frames each second. Each frame is made up of 525 individual scan lines. While, PAL is the mostly used video system or standard overseas, which transmits 25 frames each second.