What term is used to define a collection of related projects within an organization?

The correct term to define a collection of related projects within an organization is a "Portfolio." A portfolio encompasses various programs, projects, and sometimes operational activities that are grouped together to facilitate effective management and alignment with the organization's strategic objectives. This collection allows organizations to prioritize resources, assess risks, and evaluate performance across related initiatives, thereby ensuring that projects align with broader strategic goals.

A portfolio is distinct from a program, which refers to a group of related projects managed in a coordinated manner to obtain benefits and control not available from managing them individually. While operations entail the ongoing activities that produce goods and services, and strategy involves the high-level plan to achieve an organization's goals, the term "portfolio" specifically captures the essence of managing multiple projects that share a common goal or benefit.