PDM or Product Data Management is a category of computer software that aims to create an automatic link between CAD and a database, usually with data on what components something drawn using CAD consists of. This enables automatic reports on product costs, etc.
Most PDM packages are industry specific. Most larger CAD vendors have some kind of PDM offering.
Standard off-the-shelf CAD (AutoDesk, etc) has PDM functionality built in. CAD vendors in an industrial niche usually have a separate closed offering (example, textile CAD - Lectra, Gerber, etc)