One Point Perspective
The illusion of space is achieved through perspective drawing techniques and shading.

Perspective, is basically things getting smaller the further they are
away from you

One Point perspective
Perspective in which all the parallel lines converge at one single point on the horizon line.

Linear Perspective
A technique that allows us to represent three dimensional objects and space on a flat surface. 
Objects appear to get smaller and closer together, the further away they are.  

Vanishing Point
The point where parallel lines appear to meet in the distance.  

Horizon Line
The horizontal line that defines the edge between the earth and the sky. The horizon line will always be in line with your eye level.

Parallel Lines
2 or more lines running equal distance apart. They do not touch.
All CONVERGING LINES or all the lines that move away from or towards the viewer connect to the same point, (vanishing point), on the horizon line.
What does one-point perspective look like? 
Railroad tracks are always parallel, but they seem to appear to converge in the distance.
The lines moving away from us appear to get closer together as they get more distant and meet at the vanishing point in the distant.