The secondary is a group of players in the defensive unit that typically stand in the defensive backfield or the area behind the line of scrimmage and the defensive line. The safeties serve as a last line of defense between the opposing team's offense and the end zone. Safeties can also be used to blitz or defend the run.
The differences between a strong safety and free safety are based on the following:
|REMEMBER: The strong side is the side of the line that the tight end lines up on. The other side of the field is called the weak side.|
Regardless, both the free safety and strong safety are important players on a football team.