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The magnetic field of a bar magnet is strongest at either pole of the magnet. It is equally strong at the north pole compared with the south pole. The force is weaker in the middle of the magnet and halfway between the pole and the center.
A magnetic pole is a point at either end of a magnetic field where the magnetic force is concentrated and strongest. The easiest way to visualize the poles of a magnet is by using a bar magnet, the kind you probably came across in a science class in school. That type of magnet is called a permanent magnet because its magnetic properties are constant. The two ends of a permanent magnet are its poles. The magnetic field surrounding the magnet and the force it exerts are depicted using curved lines with arrows called magnetic field lines.