Which type of disc is used by a DVD player for video playback?

The correct response is DVD because it is the specific format designed to hold and play back video content on DVD players. DVDs utilize a different method of data storage from CDs and VHS tapes, enabling them to store more information and deliver higher quality video and audio.

CDs are primarily used for audio and data storage, lacking the capacity for the higher video quality that DVDs provide. Blu-ray discs represent a newer technology that surpasses DVDs in storage capacity and video quality, but they require a compatible Blu-ray player to function. VHS tapes are an older format that records video in an analog format, fundamentally different from the digital format of DVDs. Thus, within the context of a DVD player, the only appropriate choice for video playback is the DVD itself, which is engineered specifically for that purpose.