WordPress is a free and open-source content management system (CMS) that allows users to create blogs and websites without needing technical skills. It was created in 2003 and is now used to power over 40% of websites on the internet. WordPress offers a supportive community, easy customization, and career opportunities for developers, designers, content writers, and SEO specialists across experience levels. Resources for learning WordPress include the WordPress Codex, WordPress TV, and WPBeginner.