Over-expose Backlit Subjects 

Backlit subjects can fool the camera meter and cause a silhouette effect when subject detail is otherwise needed. Some cameras have an Exposure Compensation Button or Dial which will give more light to the foreground. 

If your camera does not have this facility move in or zoom in towards your subject and use either the 'Exposure Lock Button' or use the meter reading for the subject, and then zoom out. 

Click to see some examples