Google Calendar was released in 2006 as a tool for organizing your daily events online. With its color-coded schedules, easy-to-setup reminders, email notifications and invitations, Google Calendar has simplified many users hectic agendas.
One of the reasons Google Calendar has gained popularity is because of its integration with Gmail. You can create an invitation and send it through Gmail without accessing your Google Calendar. Or, create an invitation in Google Calendar and send the invitation directly to recipients' inboxes, without the need to create and send a separate invitation through Gmail.