The red Snap on Snapchat indicates that a user has received a Snap from a friend or follower.
When a user receives a Snap, the Snapchat app will display a red Snapchat icon next to the name of the friend or follower who sent the Snap.
This alerts the user that they have a new Snap waiting for them.
To view the Snap that the red Snapchat icon is indicating, the user can swipe right on their screen to open the Snapchat app.
The user will then be able to see the Snap that was sent to them by their friend or follower.
The user can then view the Snap and reply with a Snap of their own if they want to.
If the red Snapchat icon is not disappearing after a user has viewed a Snap, it may be because the user has not yet opened the Snapchat app to view the Snap.
In this case, the user can swipe right on their screen to open the app and view the Snap.
Once the Snap has been viewed, the red Snapchat icon should disappear from the app.