Post graduate, or PG for short, is a term for a person who has finished graduate school and is working as a teacher or college professor. It stands for Parental Guidance, but some people also use the term as a prayer or exclamation. It simply means "Please God" or "Please don't do that!" If you have kids, you probably want to make sure they know what to expect from these movies. PG Soft's games weave together 3D gameplay with beautiful artwork and purpose-built algorithms.