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A point is a location in space that has no size, no width, no length, and no depth. It is represented by a dot and named with a capital letter.
A line is a straight one-dimensional figure that extends infinitely in both directions. It has no thickness and is defined by any two points on it.
A ray is a part of a line that has one fixed endpoint and extends infinitely in one direction. It is named by its endpoint and another point on the ray.
A line segment is a part of a line bounded by two distinct endpoints. Unlike a line, it has a definite length that can be measured.
A plane is a flat, two-dimensional surface that extends infinitely in all directions. It is defined by three non-collinear points.