What is a DVDRW?

A DVDRW, which stands for Digital Versatile Disc ReWritable, is indeed a type of digital video disc that allows data to be written, erased, and rewritten multiple times. This characteristic makes it distinct from other forms of storage media. Unlike a standard DVD-R, which is write-once, a DVDRW can be used repeatedly, giving it flexibility in data management such as software updates, video recording, and file storage. This versatility is useful for users who need to frequently modify the content on their discs.

The other options provided don't accurately define a DVDRW. A type of permanent storage device would not describe the rewritable nature of a DVDRW. Describing it as obsolete overlooks its continued use for certain applications. Lastly, it is not an external hard drive but rather a disc format primarily designed for video and data storage. Understanding these aspects is essential for grasping the functionality and application of DVDRWs in the realm of data storage.