Passwords such as admin, p@ssw0rd, or 12345 are familiar and insecure. The most common, least secure, is none of these.
You only have to look at the number of Forbes cybersecurity news articles there has been this year which involve the compromise or leaking of passwords to see that people continue to make poor credential choices. Every year there’s at least one compilation of the weakest passwords published, and every year the likes of admin, p@assw0rd and 12345 feature towards the top. However, new research has revealed there’s a less secure and more common password. If you are using it, then I strongly advise you to change it now.