Now that you have CodeIgniter downloaded and unzipped, take a minute to look at the file structure. The more familiar you are with it, the better off you'll be as you start to code. Figure 3-3 illustrates the initial folder structure you'll see. Take a quick look at it now.
As received, the CodeIgniter root directory contains two files and two folders. The two files are index.php (which you want to keep there no matter what) and a license.txt file, containing CodeIgniter's license agreement. The two directories are user_guide/ (containing a version of the online documentation at www.codeigniter.com) and system/.
Here's what that .htaccess file would look like. It basically contains instructions that allows certain files and folders to be viewable on the web site: