This riddle asks: What has a beginning but no end? A useful way to solve it is to think about geometry rather than everyday objects.
The answer is a ray.
In geometry, a ray starts at one endpoint and extends forever in one direction. That means it has a clear beginning, but it has no ending point.
This makes a ray a perfect fit for the wording. A line has no beginning and no end, while a line segment has both a beginning and an end. A ray sits between those two ideas: one fixed endpoint and infinite extension in one direction.
The riddle feels mysterious until you switch from ordinary objects to a simple mathematical concept. Once you do, the clue matches exactly.
