title: Best way to store data in C++
body: <p>I'm just learning C++, just started to mess around with QT, and I am sitting here wondering how most applications save data?  Is there an industry standard?  Do they store it in a XML file, text file, SQLite?  What about sensitive data that say accounting software would need to save?  I'm just interested in learning what the best practices for this are.  </p>
  
  <p>Thanks</p>