Which type of disc is known for having a higher storage capacity than CDs and DVDs, specifically for high-definition videos?

Blu-ray discs are recognized for their higher storage capacity compared to CDs and DVDs, making them particularly well-suited for storing high-definition video content. The technology used in Blu-ray allows for more data to be packed into the same physical disc size; it utilizes a blue-laser technology that operates at a shorter wavelength than the red lasers used for CDs and DVDs. This allows Blu-ray to hold significantly more data — typically around 25 GB on a single-layer disc and 50 GB on a dual-layer disc, which is ideal for the larger file sizes associated with high-definition video.

The other options, while capable of storing data, do not match Blu-ray's capacity. DVDs typically hold 4.7 GB (single-layer) and 8.5 GB (dual-layer) of data. HD DVDs offered some enhancement over standard DVDs but still fall short of Blu-ray's capacity. CDs generally hold only around 700 MB of data, making them unsuitable for high-definition video storage. Thus, the choice of Blu-ray as the correct answer aligns perfectly with its design purpose and technological advantages in terms of storage capacity for high-definition videos.