When it comes to training cats, there are three important steps you have to follow:
Step 1: Create an environment that encourages the cat to do the behaviour you want.
Step 2: Let the cat know what behaviour they did correctly.
Step 3: Reward the cat for the correct behaviour.
The clicker is in charge of Step 2. Think of the clicking sound like taking a snapshot of the cat's behaviour so that they know what behaviour they did that earned the reward.
In this video, I show you why I use a clicker and target stick to train.