Final answer:
The Project Management Institute (PMI) is the association for project management professionals, offering certifications like PMP and publishing the PMBOK Guide.
Step-by-step explanation:
The association that is designed to bring together project management professionals and to systematically capture project management knowledge is known as the Project Management Institute (PMI). This organization offers various certifications, such as the Project Management Professional (PMP) credential, that signify a level of expertise and commitment to the project management field. PMI also publishes guides and standards for project management, including the well-known guide titled 'A Guide to the Project Management Body of Knowledge' (PMBOK Guide), which outlines standards and best practices for project management.