Physics

Step 1: Understanding the Concept:
The question asks for the definition of Kinematics, a branch of classical mechanics.
Step 2: Detailed Explanation:
Kinematics is the branch of physics that describes the motion of an object without considering the forces that cause the motion. It focuses on concepts like displacement, velocity, and acceleration. The other options relate to different fields of physics:

Material property: Relates to materials science.
Elastic property: Relates to the study of solids and materials.
Optical property: Relates to optics.
Step 3: Final Answer:
Kinematics deals with the motion of an object.