Google Grant is a public service of Google.com. Look at the right hand side of any search results page on Google and you will see paid ads. These are through Google's advertising program called AdWords. Businesses pay a lot of money to Google to get these AdWords ads on various search pages that feature words that pertain to that business or product.
Google has a matching program that provides free ad space to 501(c)(3) nonprofits. All you have to do is go to Google Grant and apply. Be sure to read the eligibility requirements to make sure that your organization does qualify. It may take some time to be approved but, if accepted, Google will provide free advertising to your nonprofit.
Once you are accepted for a Google Grant, you can choose the keywords that you would like to be represented on, and write an ad. Then your small text ad will appear on those keywords as space is available. Google allows an "ad spend" of up to $10,000 per month, but says that the typical grantee in its program receives just over $300 worth of advertising on Google.com per month. How useful Google Grant ads will be for your nonprofit will depend on how well you learn the AdWords system and how skillfully you use it.
Google Grant can be a useful part of your nonprofit's online marketing program.