The human voice, whether we are talking about vocal training for singing, or even just giving a speech or presenation, is an expression and a natural part of the person themeslves. We are both physical and spiritual beings.
If you think about, you already know how to sing. Perhaps you sing “badly” at the current moment if you have not practiced, but the basic idea — anybody, even children can sing.
Natural singing is geared toward freeing that natural voice with techniques that work in producing good tone. Our voice is merely the vehicle by which we can express ourselves. Again, this expression can either be in song, or in general communication.
When we talk about a well-developed voice, that is all well and good, but in order for it to have meaning and be powerful, it needs to be backed by a personality with emotion. Otherwise, it will not succeed in performance with an audience.
Whether or not you want to be a professional singer, learning to sing will improve your personality, make you more dynamic in your life, and bring will great benefits (such as confidence).