蓝光光盘：俗称蓝光，是一种数字光盘数据存储格式。它的设计取代了 DVD 格式，可以以高清晰度存储许多小时的视频。蓝光的主要应用是用于电影等视频材料以及用于 PlayStation 3、PlayStation 4 和 Xbox One 的数字游戏的物理分发。 “蓝光”这个名字来源于用于读取光盘的蓝色激光，它还允许以更高的密度存储信息。
DVD：它是 Digital Versatile Disc 或 Digital Video Disc 的缩写。 DVD是1995年设计开发并于1996年发布的一种数字光盘存储格式。这种介质可以存储数字数据，用于存储软件、计算机文件和在DVD播放器上观看的视频节目。 DVD 提供比 CD 更高的存储容量，同时具有相同的大小。
下表列出了蓝光光盘和 DVD 之间的差异：
| Feature | Blu-Ray Disk | DVD | ||||||
|---|---|---|---|---|---|---|---|---|
| Build of the Disc | Blu-Ray’s grooves are much closer to each-other and thinner | DVD grooves are bit farther to each-other and are more dense | ||||||
| scratch-resistant | High scratch resistant and durability | Low scratch resistant and durability | ||||||
| Use of Laser technology | Blu-Ray laser is blue and has a wavelength of 405nm. | DVDs use red laser which works on the wavelength of 650nm | ||||||
| Resolution of the Image | It stores High-Definition (HD) videos | It stores Standard-Definition (SD) videos | ||||||
| Data Storage Capacity | Blu-rays can store data up-to 50GB and can even store multiple long movies | A DVD can store data up-to 4.7GB(Gigabytes), which is sufficient to store a short movie. A double-layered DVD can store upto 9GB of data | ||||||
| Security | Highly secured from factors like data loss and has 0.1 mm protection layer | Low security of data as compared to Blu-Ray and has 0.6mm protection layer | ||||||
| Disc Players/Readers | All Blu-ray player can play DVDs | The DVD player cannot read Blu-Ray disc as the DVD laser is too big to read a Blu-Ray disc | ||||||
| Cost | Blu-Ray are bit expensive to that of DVDs | If your need is to spend less money and you don’t care about the quality of the picture, you can go for the DVDs. | Data transfer rate | Blu-Ray can transfer data at the rate of 36 Mbps | DVDs can transfer data at the rate of 11 Mbps. | Numeric aperture | Blu-Ray has an aperture of 0.85 | DVDs has an aperture of 0.60 |