Database Security - User ID Encrypted?

Hi, I’m interested in knowing whether the User ID created and stored whenever a new member signs up to your website is private/secure/encrypted.

I would like to use the ID to differentiate between users but want to make sure it is not visible to anyone other than me. Is this true?

Thanks in advance.

Make sure you use the userID only in the backend code and it will be protected.

Many thanks Yisrael