WordPress is a powerful content management system which is popular because of its usability and scalability; however, it can sometimes have issues. The first, and best step, to ensuring a functional WordPress installation is keeping the site up-to-date. Below are step-by-step instructions for correcting some of the most common issues that occur with WordPress sites. If you do not see your particular issue, please visit the WordPress Support forum.
WordPress is an open-source, theme based Content Management System (CMS).
In simpler terms, WordPress, as a Content Management System, acts as a framework that you can use to build your site. Through the use of themes and plugins, many of which are installed with a single click and are completely free, you can style your page and add desired site functionality. This can include email forms, payment processing, location services (useful for providing directions to your business), and many more.
All this can be done through a central management portal, saving the time and effort it takes to manually build a site. WordPress’ source code is publicly viewable and provided for free, which allows for developers to look over the platform and create useful content, hence WordPress is open-source.