Express will reach its end of life and be removed from the product by July 12, 2018. After this date, you will not be able to access or use the Express theme.
Using different themes, your institution can change the look of your site. A theme contains the design elements that change the look of your institution website pages. Themes can be set at the site level and at the course level. There are several themes to choose from, including third-party designed themes. Two themes have been designed specifically for Moodlerooms - Express and Snap. Complete documentation for those two themes has been provided.
Also updating the front page distinguishes your website from other institutions.