what is pad clearance, and how to change this clearance for a footprint ,how it will affect the designer while designing , if it create any problem how to solve this.I have attached the img in this.
Note : see the img, in that the img contain red line around the pad of the footprint.
The pad clearance determines how near copper of a differing net can be. It is set in the pad or footprint properties. 0 clearance means the next level up will be used. On the board level this clearance is set per netclass.