The link you have provided answers pretty much all your answers, but still I'll quote and explain a bit more.
The word "force" in this case is not used to mean mechanical force, measured in newtons, but a potential, or energy per unit of charge, measured in volts.
It is neither the creation of potential, nor it is a process and it is not even a force. It came to be known as a force because wrongful interpretation in the past made it seem as if a force from the battery pushed the particles in a circuit. This analysis was obviously discarded later but the name prevails!
In electric circuits emf and potential have a significant difference. While the emf is the potential difference between the terminals of a source in open circuit, the potential is the potential difference betwren the terminals in a closed one.
The potential is defined as $ V = \epsilon - Ir $. Here $\epsilon $ is the emf of the source and $ Ir $ is tue potential drop in the internal resistance. It is pretty clear that replacing potential with emf in any sort of circuit is not a very wise decision, however sometimes the potential drop in internal resistance is negligible.