Voiceless sounds and Voiced sounds

• Voiceless sounds:
  s - x - c - ch - sh - p - k - f - q - gh
  

  They are made by pushing air through your mouth. 
  
  No sound comes from the throat.
  

  
  
• Voiced sounds:
  d - b - r - l - m - n - v - …
  

  They come from the throat (the voice vibrates in the neck).