# Definition:Line/Curve

## Definition

A curve is a line which may or may not be straight.

### Plane Curve

A plane curve is a curve which can be embedded in the plane.

### Space Curve

A space curve is a curve which cannot be embedded in the plane, but can be embedded in $3$-space.

### Arc

An arc is a specific part of a curve.

## Also known as

The term curve can often be seen for curved line, but is then specifically understood to mean a line which is specifically not straight.