title: Human verfication
body: <p><code>Enter certain text to verify you are human</code></p>
  
  <p>I have observed this on numerous websites, including SO. I dont know a thing about hacking, but I don't understand why is it required? Especially, in SO when making edits, sometimes it asks to enter some text to verify if it is Human or not.. I mean, how can a computer program (design for these kind of hacks) do edits (with SO's rules and restrictions on editing) , and then save them?</p>
  
  <p>Is there any other reason, these verification things are added on any website?</p>