Expanded text ads are the next generation of text ads, designed for a mobile-first world with both users and advertisers in mind. Expanded text ads give advertisers additional control over their messaging, and provide users with more information before they click your ad.
After January 31, 2017, AdWords will no longer support the creation or editing of standard text ads. New text ads generated after that date should use the expanded text ad format. Existing standard text ads will continue to serve past January 31, 2017. After this date, you will only be able to create and edit expanded text ads. However, existing standard text ads will continue to serve alongside expanded text ads.