How do satellites take pictures from the ocean?

Question: How do satellites take pictures from the ocean?
- Keywords:
  ocean,
  picture,
  satellite
Asked by Achsu to Silvia on 8 Nov 2016.
- Silvia Pardo answered on 8 Nov 2016:
  
  The same we take pictures: using a camera! The difference is that the cameras are bigger, more expensive, have better resolution and sometimes they things that the human eye cannot see, like infra-red or ultraviolet radiation.

Question: How do satellites take pictures from the ocean?