A leading line paves an easy path for the eye to follow through different elements of a photo. Usually they start at the bottom of the frame and guide the eye upwards and inwards, from the foreground of the image to the background, typically leading toward the main subject.

The easiest place to find a leading line is on a road. Roadways are inherently leading because they go somewhere, give us a feeling of motion, and the lines often point so far inwards that they reach a vanishing point – the place where two or more lines converge into theoretical infinity.