Primarily used for the focus of a lens, camera, or optical device. Also used metaphorically for the central point of attention.
from Dutch brandpunt
I adjust the focus of the camera.
This photo is out of focus.
Used in phrases like ピントが合う or ピントがずれる to describe whether a statement or discussion is on-point or off-point.
His opinions are always off-point.
The question is not to the point.
I focused the camera on the flower and took a picture.
His answer misses the point of the question.
This photo is a bit out of focus and looks blurry.