ExpressionEngine is a Content Management System developed by EllisLab. The current version is 2.1. ExpressionEngine is intended to be simpler to use than other content management systems; for instance, it requires no knowledge of PHP, and has extensive online documentation. ExpressionEngine's proven capability, combined with its world-class support, is a recipe for online success!

ExpressionEngine, which is a more general purpose content management system written in object-oriented PHP and using MySQL for storing data. Licenses are available in three variations: a "Non-Commercial" version for personal and non-profit use, a "Commercial" version, and the cheapest option, a "Freelancer" license intended for small Web firms to be able to run their own sites. The underlying code is identical in all cases, although there are several modules held back from the "Freelancer" version. A 30-day free trial is available, but none of the licenses are free at this point.

In order to run ExpressionEngine your web server must support:

PHP version 5.1.6 or newer.
MySQL version 4.1 or newer.
Your hosting account must have the following minimum MySQL grant privileges for database tables:
SELECT
INSERT
UPDATE
DELETE
CREATE
ALTER
DROP
16MB memory allocated to PHP

To take advantage of the image thumbnailing feature your server must support one of the three image manipulation protocols: GD, ImageMagick, NetPBM.

To create a site with ExpressionEngine, you must have at least minimal experience with HTML and understand how to create a website. Further, you must be familiar with the process of uploading files to your server via FTP.