Social preview
A social preview is the picture and title that appear when someone shares your link in a chat or on social media.
In a simple example
You send your link in a group chat, and a card shows your logo, your name and one short line.
Why it matters to you
A good preview makes people tap your link. A missing one looks like spam.
Do not confuse with
The preview is not part of the page that visitors see. It is extra information that apps read.