Quality management is explained in chapter 8 of the PMBOK (5th edition). The quality management processes define the policies and procedures for the project to ensure that the product, service, result of the project meets the requirements.
Processes:
PMI's ten knowledge areas: Integration management, Scope management, Schedule management, Cost management, Quality management, Resource management, Communications management, Risk management, Procurement management, Stakeholder management
Related: PMI processes, quality, deliverable
Project quality management is described in chapter 8 of the PMBOK, 5th edition.