What are sharia laws?

Sharia laws are laws based on the Quran; the holy book of Islam.
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Sharia law is based on:
  1. Quran, Muslims holy book revealed by God to prophet Muhammad (PBUH),
  2. Sunnah, prophet Muhammad (PBUH) teachings (sayings and practices),
  3. Qias, comparing with similar cases in Quran or Sunnah. For example, drugs are forbidden although not mentioned in Quran and Sunnah but because drug effects are the same when compared with alcohol (that is forbidden in Quran and sunnah explicitly), and
  4. Ijmaa, issues where all Islam religion leaders agree upon.