The physical action of singing or speaking is the same for everyone. However, the reason we all sound different to each other is down to our physical attributes. The size and thickness of our vocal cords, the shape of our bone structure, the position of our teeth, our nasal cavity, our sinuses, our tongue.
Once that sound wave is produced by our vocal cords, it travels up towards our mouth and nose, where we resonate that sound wave around our head, shaping and polishing before we exhale our own unique sound.
Your tone and resonance can be improved as you learn to sing. As a singer, learning how to control your breath and using vocal exercises to help you strengthen and develop flexibility in your voice, along with learning how to place notes, polishing the notes in order to make them sound how you want.