Two big reasons: 1) Hackers 2) To make sure things keep working as they should. The first thing to know is that hackers work 24/7 on all websites, globally. Hackers. Never. Stop. Even if they aren't really trying to get into your site, they may use it to hack bigger fish on the server or at your host. Websites are being attacked all the time, but unless you have some type of security software or you actually get hacked, you'd probably never know it.  Websites can be hacked through all kinds of ways, from security vulnerabilities on their hosting platform; a security issue in their WordPress theme or a plugin; or because of a weak username or password. Your hosting company should support the latest versions of PHP and MySQL; have experience with and is optimized for running WordPress; scan for malware and intrusive files, and have a knowledgeable and accessible staff. (Some of the reasons why we love our preferred host!) If you do not update your website’s software (WordPress, your theme, your plugins), you are more susceptible to attacks and for things to quit working. WordPress and most themes and plugins release major and minor updates throughout the year to comply with new privacy laws, provide new features, fixes to security, bugs, or errors, and other important things. Updates are also important to ensure your software functions properly. Just like those annoying iphone updates you must do in order to keep using your favorite apps, WordPress, themes, and software work the same way. Or (I love analogies), like keeping your car running takes ongoing maintenance, your website needs maintenance to keep it purring like a kitten. Updates and security are non-negotiable!