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Wordpress was developed as a blogging tool but has evolved into a full content management system, although its blogging heritage is fairly clear. The core system can be extended using 'plugins', which like Drupal, are contributed by users.
Wordpress is highly customisable and perhaps a little easier to get to grips with than Drupal in terms of both site administration and scripting. As with Drupal, Wordpress is available under the GNU General Public License (GPL).
Whilst the system is freely available most websites are likely to need optional plugins. Deciding which plugins to use, evaluating options and then configuring them can be time consuming. Whilst a wide range of plugins are available, a fairly standard site may not need quite so many add-ons as is the case with Drupal. I'd suggest Drupal modules tend to be a bit more robust than might be the case with Wordpress. Commercial plugins also appear a bit more prominent - and being prepared to buy where necessary may be a good idea.
As an open source system Wordpress code is also available to potential hackers. For this reason there are frequent updates and it is a good idea to install these promptly. For this reason Wordpress sites do require maintenance - installing updates and backing up. There is potential for conflicts to arise between plugins and updates so having a mirror site to test run updates is a good idea if possible.
I'd suggest Wordpress is a little easier to administer than Drupal particularly for file uploads (i.e. images and documents). I'd recommend Wordpress for small to medium sized sites, particulalry where potential administrators are not too technically minded.