the absolute value of the maximum displacement from a zero value during one period of an oscillation.

time required for one complete cycle of vibration to pass a given point

It is a force that acts to bring a body to its equilibrium position. The mass or particle, and it is always directed back toward the equilibrium position of the system.

the condition of a system when neither its state of motion nor its internal energy state tends to change with time

a single change from up to down to up, or as a change from positive, to negative to positive

the number of waves that pass a fixed point in unit time, also, the number of cycles or vibrations undergone during one unit of time by a body in periodic motion

When we speak of a vibration or oscillation, we mean the motion of an object that repeats itself, back and forth, over the same path.

swing, musical instrument, Bungee jumping, Hearing

2 real life example
1) ripples on the surface of water.
2) vibrations in a guitar string

the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.

the point on a wave with the greatest positive value or upward displacement in a cycle