Many consonants come in pairs, voiced and unvoiced. In the voiced version you are vibrating your vocal cords, i.e. using your voice, while in the unvoiced version your vocal cords are silent. Otherwise the mechanisms of producing the sound are identical. Here are some examples.
Unvoiced: p as in pat, voiced: b as in bat.
Unvoiced: t as in ten, voiced: d as in den.
Unvoiced: s as in sit, voiced:z as in zit.
Unvoiced: f as in fat, voiced v as in vat.
I am not sure if the following is correct or not, but it may be helpful:
شكرا جزيلا على جوابك