2 of 4 Explanatory notes

Did the Big Bang happen at a point?

TV documentaries invariably show the Big Bang as an exploding ball of fire expanding outwards. Did the Big Bang really explode outwards from a point like this? If not, what did happen?

This is intended to be a canonical question that we can link to whenever necessary. I've added an answer and made it a community wiki so anyone should feel free to edit it. Alternatively feel free to add more answers if you want to present a different perspective.