PBL Works has this useful chart explaining the difference between projects and project based learning. You may want to check it out to learn more.
New Handy Chart on The Difference Between Projects and Project-based Learning
Project based learning is all about driving learning through the use of academically rich projects. The concept of projects advanced in PBL philosophy is different from the mainstream meaning of projects. According to PBL Works, projects in a PBL lesson are the vehicles of teaching and learning and are not simply a mere component of the lesson.
You can also check out these resources and books to learn more about how to effectively integrate project based learning in your teaching.