This is the URL that is displayed along with your ads. It can vary from the destination URL (the actual address of the landing page) but must use the same root domain.
The display URL gives users an idea about what they’re going to see after clicking on your ad.
For example, Yash has a furniture eCommerce website & is running ads for tables. His ads might be displayed with the URL “www.example.com”, while the destination URL is “www. example.come/home furniture/tables”.
You are allowed 35 characters for a Display URL in Google Ads.