PVCS Version Manager is a software tool used for version control and configuration management of software source code, documents, and other files. It allows team members to work collaboratively on a project and keep track of changes made to code or files over time, ensuring the consistency and integrity of the project. The tool also provides features for branching, merging, labeling, and auditing changes in the codebase. As a specialized skill, PVCS Version Manager requires knowledge of software development practices and the ability to effectively use the tool for managing project development.