Magnetism is a force of attractoin or repulsion between various substances, especially those made of iron and certain other metals. Magnets have north poles and south poles. These attract eachother. But two north poles will repel each other, as will two south poles.

Repelling magnets. Credit goes to BBC KS2 Bitesize
Repelling magnets. Credit goes to BBC KS2 Bitesize
This is two north poles repelling eachother.

Attracting magnets. Credit goes to BBC KS2 Bitesize
Attracting magnets. Credit goes to BBC KS2 Bitesize
This is a north pole and a south pole attracting eachother.

Some magnets are stronger than others. Strong magnets will create bigger pushing or pulling forces then weak magnets. Ring magnets also have a north and south pole. The north pole is found at the top of the ring and the south pole is found at the bottom. Ring magnets attract and repel each other in the same way as the bar magnets.

Attracting ring magnets. Credits go to BBC KS2 Bitesize
Attracting ring magnets. Credits go to BBC KS2 Bitesize
This is two ring magnets attracting each other.

Repulsing ring magnets. Credits go to BBC KS2 Bitesize
Repulsing ring magnets. Credits go to BBC KS2 Bitesize
This is two ring magnets repelling each other.