Is More Flow Better, Is The Smallest Intake Port That Flows The Most The Best
It's physics.
Torque is the rotational force that moves an object.
Horsepower is a measure of work. It determines how fast the object moves (accelerates), because it is a measure of how often the torque is applied over a given timeframe.
The more torque you have, the larger the object you can move.
The more horsepower you have, the faster you can move (accelerate) that object.
The problem is, combustion engines do not make linear torque (unlike an electric engine), so rpm is not just a function of the amount of work being done (HP = Torque x RPM/5252), it also determines where the most force (torque) is generated.
Dyno measures torque and rpm, it measure by giving an engine a job, if you free rev your engine you make rpm but very little torque. A running engine alway produces power even in a free rev just not that much, a quarter mile run is max power and driving is everything in between power.
Think of it like electrical terms, you'd be watt's is a calculation and amps is all that matters and volts that probably does something but not too important.
If you free-rev an engine with your foot to the floor, it most certainly
is making torque – the torque (rotational force) is just not being applied to anything. There are other dynamics in motion, but that's the simple answer.
"And volts, that probably does something but not too important"
Watts = V x I ("I" being the universal symbol for current). Volts are a measure of potential difference and current measures the flow of electrons. Potential difference x current = power.
TLDR version: Torque moves the car, Horsepower determines how fast it accelerates.