The defenders job is to defend and to see that the ball does not go near the goalkeeper.
A back is a defender.
Neelanjan LakshmanPique
Yes, if you are a defender.
defender
a defender that is on the right side
Defender...
Pressure of the defender
goalie, defender, midfielder, forward
John Terry of Chelsea and England.
Today it is the Brazilian Danny Alaves.
Defender or Midfielder
The defender usually depends on the sport. In soccer (football) the defender is the one that protects the goal. I don't know much about football (American Football)