They are not touching each other, but they have a small gap between each other and they communicate via a synapse.
Of course, there are some exceptions but it’s at a level too advanced for the IMAT material and there is no need to know it.
@AriHoresh thanks dear Ari!
But why they are not touching each other? Because they are actually physically connected to each other in synapse, I mean the presynaptic cell knobs and the postcynaptic soma are physically connected…
They are not physically connected to each other, but physiologically connected, I think you are mixing the terms.