There are two types of Google account users: Google account and Google Apps Account. The Google Integration aims to provide benefits to both types of users. 

• Google Account - Google Account is a single sign-in system that provides access to a variety of free Google consumer products such as Gmail, Picasa, Google Drive, Google+, iGoogle, etc. that are administered by Google.
  
• Google Apps Account - Google Apps Account is similar to a Google Account, except that it is administered by your organization. This account brings together a suite of Google applications that are essential for your business.
  
• Google Ads - Google Ads is an online advertising program designed to help you reach new customers and increase sales for your business through ads on Google Search and across Google's network of partner websites. The integration will allow you to import Google Ads marketing investments into Zoho CRM so you can see which keywords and campaigns are responsible for each offline sale. You can also export sales data from CRM to Google Ads and optimize the bids and budgets to yield maximum revenue and profits. 
  

Learn more about the differences between Google Account and Google Apps Account here.

For both the Google Account and Google Apps Account users, Zoho CRM offers features that allow to integrate data between Google and Zoho CRM; thereby, providing a more unified working experience.