I am known for my silence,
But I can also be kind of loud.
I can be found throughout the world,
But I cannot be found naturally.
I am voiceless,
Yet I am voiced everyday.
I begin at the back and make my way forward.
What am I?
Hint 1
I am used for communication.
Hint 2
My use is demonstrated within this riddle.
Hint 3
The first two lines give me away.