PFF (Pro Football Focus) is a sports analytics company that focuses on thorough analysis of the National Football League (NFL) and NCAA Division-I football in the United States. PFF produces 0–100 Player Grades and a range of advanced statistics for teams and players by watching, charting, and grading every player on every play in every game both at the NFL and FBS level. PFF grades every NFL player on every play on a scale of -2 to +2 using half-point increments. The grades are based on context and performance, and they evaluate every player on every play during a football game. PFF grades are a qualitative ranking that measures performance in ways that stats like yards after catch or QB rating cannot. The grades are not grading talent in these numbers, rather strictly performance on the field. Talented players can have bad games, runs, or even seasons, and often players without nearly as much talent can put together impressive play on the field. PFF rankings are more of a performance evaluation and a reflection of how efficiently a player made plays in the time he was on the field. PFF grades can be used to rank players and teams, and they help quantify skill so you can compare one player or team to another. PFF Power Rankings are adjusted based on coach, team, and player performance.