title: how to answer HLD and LLD
body: <p>I have recently attended Amazon Interview and got rejected after design round, its happened three times with Amazon in 2 year, i always getting rejected because of design round.
  please help me to know how should i answer an design question.
  questions like 
  1) design elevator control system
  2) design whisper-sync feature (used in Amazon instant video platform)
  they ask me to design End to end
  HLD
  LLD
  i did not get what exactly differ in both, i explain as a algorithm wise, but could not properly by HLD and LLD.</p>
  
  <p>i mean i searched alot, but could not found a way to answer such question.</p>
  
  <p>Any help will be good for me.</p>
  
  <p>Thanks,</p>