A fact can be proved by either direct evidence or circumstantial evidence, or by both.
If an eyewitness testifies about what the witness saw, that is an example of direct evidence.
If the ground is bare when you go to sleep but is covered with a blanket of snow when you awake, this is circumstantial evidence that it snowed while you were asleep.
Endreson v. Beretta USA Corp., 1997 ND 38, 560 N.W.2d 225
Bismarck Baptist Church v. Wiedemann Indus., Inc., 201 NW2d
434 (ND 1972)