system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does the bullet go where the sight of the gun is even tho the barrel is lower than the sight?

I don’t understand how on a rifle or any gun the sight of the gun is often above the barrel yet the bullet goes where the sight is. 
Does the bullet always go where the sight is or is there always going to be some inaccuracy?
gpt
You set the sights up so they “zero” at a certain distance.

The barrel will be angled very slightly up compared to the sights. Imagine you draw a line straight down the sights and another straight down the barrel - they’ll intersect at some distance away. You set up the sights so the bullet lands on the bullseye at a known distance (eg 100 yards). (The actual process also compensates for “bullet drop” as the bullet is continually being pulled down by gravity just as one you drop out of your hand would be.

Then if you want to shoot further - say 200 yards you adjust the sights by a configured amount (“clicks”) on the adjustment wheel to compensate for the bullet falling over the second 100 yards of the shot.

The “misalignment” is actually essential to being able to shoot any significant distance. If the sights somehow were completely aligned with the barrel then you couldn’t make the required adjustments to compensate for the bullet falling during its flight.