Direct evidence does not require any reasoning or inference to arrive at the conclusion to be drawn from the evidence.
Example: If a person testified that he or she looked outside a window and saw rain falling, that is direct evidence that it rained.
Indirect evidence, requires that an inference be made between the evidence and the conclusion to be drawn from it.
Example: If, on the other hand, a witness testified that he or she heard distant pitter patter, and later walked outside and saw that the ground was wet, smelled freshness in the air and felt that the air was moist, those sensations would be indirect evidence that it had rained.