Question

What is the oscillation of a pendulum?

Answer 1

The to and fro motion of the pendulum is known as the oscillation of the pendulum.

1. When a pendulum starts moving from a maxima point $A$ and moves to the other maxima point $B$and then returns to its initial point $A$,then the pendulum completes its one oscillation.

2. The time taken (by the bob here) to complete this one oscillation is called the time period.