These models help to explain it visually.
Scroll down for different models ranged by isolation.
https://www.washingtonpost.com/graphics/2020/world/corona-simulator/
BTW, those models are not static animations, the movements of the infected are random every time you rerun a model.
And for those who keep trotting out comparisons to the common flu, which we generally have a vaccine for and ~50% of the population gets, that vaccinated population replaces socially isolated people in these models.