An edge is the line where two surfaces meet, like the border of a table or the sharp side of a knife blade. When you run your finger along the edge of a piece of paper, you're tracing that thin boundary where the paper's surface ends.

The word carries different meanings depending on context. In geometry, an edge is where two faces of a solid shape meet: a cube has twelve edges. In competition, having an edge means possessing an advantage that makes winning more likely. A chess player who studies her opponent's past games gains an edge. A runner who trains at high altitude might have an edge in an important race.

When someone seems nervous or irritable, we say they're on edge, like standing too close to a cliff's edge where one wrong step could mean trouble. To edge somewhere means to move slowly and carefully, the way you might edge along a narrow ledge or edge closer to the front of a crowd.

People sometimes use cutting edge to describe the newest and most advanced technology or ideas, like the leading edge of a blade that cuts first. Scientists working on artificial intelligence or quantum computing are at the cutting edge of their fields.

The word suggests boundaries, sharpness, and that interesting space where one thing ends and another begins.