Theory:

The attracting property of magnets:
For this activity, we require a steel glass, a needle, and a thread.
 
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Needle gets attracted to the steel glass
  1. Attach a thread to a needle.
  2. Keep a finger at the end of the needle, where the thread starts. 
  3. Raise the steel glass near the needle.
  4. It is seen that the needle is raised vertically up in the air without any support, showing the attracting property of magnetic materials.
Poles of a magnet:
A bar magnet when placed in a sheet spread with iron filings, attracts the filings towards its ends.
 
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Bar magnet attracting iron filings
The ends of a bar magnet that attracts most of the iron filings are called its poles. The attractive force of the magnet is high on its two ends.
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Bar magnets
 
All magnets will have two poles, north (N) and south (S) poles.
The north pole of the magnet is the end of the magnet that points towards the north. The south pole of the magnet is the end that points towards the south.
The magnetic force is maximum at the poles and minimum at the centre of a bar magnet. This applies not only to a bar magnet but also to all kinds of magnets. For example, if a horseshoe magnet or U-shaped magnet is kept near the iron filings, it is observed that more iron filings stick to the poles compared to the centre of the magnet.
 
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Horseshoe magnet