• It’s the leading Content Management System and a reliable platform that is going to be around for much longer (see CMS Usage Statistics: https://trends.builtwith.com/cms).
• WordPress is open source and licensed under the GNU General Public License. Users get access to free updates and thousands of free plugins and themes.
• On a self hosted WordPress install your data is your own (there’s no lock in).
• WordPress can be used for any kind of website (business, portfolio, hotel, vacation rental etc.). Added advantage: It has a blog function.
• It is mobile friendly. You can choose amongst many free and premium WordPress themes to build a responsive website that will scale automatically to the size of the user screen.
• WordPress is search engine friendly and ready out of the box. Numerous plugins can help you to get your SEO right.
• You can add the functions you need by way of separate plugins (highly extensible platform).
• You can start small and then scale up.
• The team at WordPress is constantly monitoring for security threats. Security updates are released promptly and minor updates are carried out automatically.
• Working with WordPress is easy. A user friendly interface helps you to create content without knowing any code.
• Team members can be granted various levels of access (enables a smooth editorial workflow).
• WordPress helps with branding. Most themes offer tons of customization options.

(Source: via @WPExplorer – Get full details at http://www.wpexplorer.com/wordpress-for-startups/ )