A CD/DVD burner is a device that allows users to write data onto CDs or DVDs. It can be found in computers or as a standalone unit. The burner uses a laser to etch information onto the disc, enabling the storage of music, videos, software, and other files. These devices can also read discs, allowing users to access the data stored on them. CDs typically hold around 700 MB of data, while DVDs can store up to 4.7 GB or more, depending on the type. Burners are useful for creating backups and sharing files.