Gmail uses a completely automated process to provide useful information and relevant ads in the sidebar of your Gmail pages:
Ads and Related Pages
Ads in Gmail are placed in the same way that ads are placed alongside Google search results and, through the Google AdSense program, on content pages across the web. The goal is to provide you with helpful ads, links and content relevant to your specific interests.
Advertising and related information are displayed based on a completely automated process. Learn more.
Addresses, Packages, and other links
When you open a message that lists an address or package tracking number, Gmail shows you handy links to maps and directions, or your package's delivery status. These links are produced automatically for your convenience. No humans read the content of your email in order to generate these links and none of them are sponsored by advertisers. We hope you'll find them relevant and useful!
Add to calendar
Gmail displays an Add to calendar link when you open a message that contains event information. To add the event to your Google Calendar, click the link and fill in the appropriate information, then click the Save Changes button. (You may be asked to sign in to Google Calendar, if you're not signed in already.)
Not using calendar yet? Click here to get started.