Switch to AL 2 or 3 from AL 1 - not sure if it affects our data

In the email we received it was stated that "AWS Account currently has one or more Amazon Linux 1 instances." From my developer: "This switch to AL2 seems to be talking about linux virtual machines . . . and the only items I'm aware that we have on AL 1 is an image container, but that is not a virtual machine." Sorry I not a developer, but am trying to determine if this affects us. Based on this little information can you tell me if this affects us?