CodeIgniter library

A CodeIgniter library is simply a class file that abstracts functionality into easy to use functions that take much of the strain off the developers. Take the Database Library as an example. It contains many functions that make the creation of complex SQL queries very easy; it also makes queries much more readable.

CodeIgniter comes with many core libraries that provide ways to code your applications much faster than without libraries, removing much of the unnecessary code from your applications, and taking the strain off the developer.