Reason for dipole and quadrupole magnets in the Large Hadron Collider

[magnetics]

According to Wikipedia, the source of all knowledge, the LHC contains some 1,232 dipole magnets with an additional 392 quadrupole magnets. What is the difference in function between the two types of magnets?

How might the effects of magnetic field gradients contribute to the differences between the two?

Thank you.

 

[Rooted]

In brief the dipoles bend the beam in the shape of the tunnel, and the quadrupoles focus/defocus the beam.

http://www.lhc-closer.es/php/index.php?i=1&s=4&p=6&e=2