Defense attributes comprises of the following: 

• Marking: A player with a high Marking attribute will have better reactions to an opponent’s dribbling move and will press closer to opponents and with more accuracy.
• Tackling: Determines how accurate your player will be when doing a standing tackle. The higher the attribute, the more consistently your player will take the ball when performing a standing tackle.
• Anticipation: Will help your player pick off fast moving balls and intercept passes at a higher rate.
• Aerial: When a player makes a shot or pass with his head, the amount of error applied is based on Heading Accuracy.
• Slide: Determines how accurate your player will be when doing a Slide. The higher the attribute, the more consistently your player will take the ball when sliding. If a CPU player has a high Slide attribute, they will prefer taking slides over standing tackles.