classical conditioning involves learning a new behaviour through the process of associations. This was demonstrated by pavlov who showed that dogs could be conditioned to salivate when hearing a bell. Before conditioning the UCS(food) produces the unconditioned responce UCR salivating
during conditioning the UCS(unconditioned stimulus) is paired with the neutral stimulus (bell) which produces the (UCR) this is repeated until association occurs between the UCS and the NS
after conditioning the NS becomes the CS which now produces the CR (salivating)