Do a bit if research into File Inclusion Vulnerability. What is it? Why is is dangerous?

 Do a bit  if research into File Inclusion Vulnerability.

  • What is it?
  • Why is is dangerous?
  • What is the difference of low and remote inclusion?
  • What methods can me employed to prevent a security breach?
  • What programming languages are vulnerable to this type of attack.

Post between 100-300.