What is pgf?

PGF, or "Portable Graphics Format," is a vector graphics-based tool used primarily in LaTeX documents for creating high-quality graphics. It allows users to create complex diagrams and figures programmatically, using a straightforward syntax. PGF is often combined with TikZ, an extension that adds even more features for drawing and visualization. Together, they enable precise control over graphics while maintaining the quality and scalability of vector images.