What is the displacement of a particle from a position graph

The video tutorial explains the concept of displacement, focusing on how to calculate it by comparing the initial and final positions of a particle. It uses a specific example to demonstrate the calculation process, resulting in a displacement of -6 inches. The tutorial also discusses how to interpret the negative result, indicating the particle's movement direction.

How does the direction of displacement affect the interpretation of the particle's movement?

What units are used to express displacement in this context?