PBL is an instructional approach that uses authentic real-world projects to engage students and teach 21st century skills through in-depth learning done in groups, allowing students to reflect on their own ideas, make decisions that affect project outcomes, and take ownership over their learning process. PBL means learning in depth through group projects on authentic tasks that engage students and teach important skills. It allows students to reflect on their ideas, make choices that impact projects, and take control of their learning.