Google Apps is a service from Google providing independently customizable versions of several Google products under a custom domain name. It features several Web applications with similar functionality to traditional office suites, including: Gmail, Google Groups, Google Calendar, Talk, Docs and Sites. Google Apps is free and offers the same amount of storage as regular Gmail accounts. Google Apps for Business, which offers additional e-mail storage, is available for an annual fee per user account. Google Apps for Education, which is free, combines features from the Standard and Premier editions. In addition to shared apps (calendar, docs, etc.), there is Google Apps Marketplace, which is an App "store" for Google Apps users. It contains various apps, both free and for a fee, which can be installed to customize the Google Apps experience for the user.