Periodic Motion
Periodic motion refers to a type of motion that repeats itself after a fixed interval of time. In other words, the motion of an object is cyclic and follows a regular pattern. The time taken for one complete cycle is called the period of the motion. This type of motion can be observed in various natural phenomena and man-made objects.

Examples of periodic motion include the swinging of a pendulum, the motion of a bouncing ball, the oscillation of a guitar string, the rotation of the Earth around the Sun, and the revolution of the Moon around the Earth.

Non-periodic Motion
Non-periodic motion, also known as irregular or random motion, does not repeat itself in a regular pattern over time. The motion of an object in non-periodic motion is not predictable and does not follow a specific cycle. It can occur due to external forces acting on the object or random disturbances in its environment.

Examples of non-periodic motion include the movement of a car in traffic, the flight path of a butterfly, the motion of a falling leaf, and the waves in the ocean.

Motion and Its Types
Motion is a fundamental concept in physics that refers to the change in position of an object over time. It is described using various parameters such as distance, displacement, speed, velocity, and acceleration. There are three main types of motion:

1. Rectilinear Motion: This type of motion occurs when an object moves along a straight line. The object's motion can be either uniform, where the object covers equal distances in equal intervals of time, or non-uniform, where the object covers unequal distances in equal intervals of time.

2. Circular Motion: Circular motion occurs when an object moves along a circular path. The object's direction constantly changes, but its speed may remain constant. It can be observed in the motion of a spinning top, a car moving around a curve, or a planet orbiting around the Sun.

3. Rotational Motion: Rotational motion refers to the spinning or rotating motion of an object around an axis. It can be seen in the rotation of a wheel, the spinning of a top, or the movement of a propeller. The object's motion can be either uniform, where it rotates at a constant speed, or non-uniform, where its rotational speed changes.

In conclusion, periodic motion repeats itself in a regular pattern, while non-periodic motion does not follow a specific cycle. Motion can be categorized into rectilinear, circular, and rotational motion based on the path and nature of the object's movement.