What is destination URL?

[grofee]

The destination URL is the webpage URL people are taken to after they click your ad, which is different than the display URL that is the webpage address that appears in your ad. Destination URLs can go up to 2048 characters versus the standard 35 character limitation on display URLs

[Akshay_M]

A destination URL is the web address of the page a user is taken to when they click a link from another web page, document, or application. It's also known as a "click URL" or "landing page URL".
Destination URLs are made up of the landing page URL and tracking parameters. Google ad and keyword tracking relies on destination URLs.
The character limit for a destination URL is 1024 characters. However, most platforms have a maximum limit of 2,048 characters.
If there is no web page URL, you can enter an email address or a phone number.