title: x00, xEF, xC8 - what type of format are these?
body: <p>I base64 decoded a string and I now have a string made up of 'X00', 'xEF', 'xC8' etc...</p>
  
  <p>What are these (characters?), or can they be decoded into something else?</p>
  
  <p>I Want to learn more about it, but can't find anything on Google.</p>
  
  <p>Thanks</p>
  
  <p>(I had no idea what to enter as a tag so feel free to amend it)</p>