How does dyke differ from sill?

A dyke and a sill are both types of igneous intrusions, but they differ in their orientation and formation. A dyke is a vertical or steeply inclined intrusion that cuts across the existing rock layers, while a sill is a horizontal or near-horizontal intrusion that lies parallel to the existing rock layers. Dykes typically form from magma that rises through fractures, whereas sills form when magma intrudes between layers of rock. Their differing orientations influence the geological features and structures they create.