A portfolio is a view of all programs or projects that a company has in its pipeline to meet business objectives. Portfolio strategy involves the path the investors can take to use the company’s assets to attain financial goals while project portfolio takes into account all projects and programs managed together to achieve an organizations/business objective. Evaluation of multiple projects by grouping them into strategic portfolios is known as portfolio management

https://www.wrike.com/blog/major-challenges-enterprise-project-portfolio-management/