Are "api-key" and "app-key" the same thing?

Question

When tagging my last couple of questions about registering for a key, I noticed there are two similar-looking tags:

• api-key - 35 uses and a tag wiki
• app-key - 10 uses (Update: retagged), no tag wiki

• Do they both refer to the same thing?
• Is "api key" the correct term we should all be using?
• Should "app key" be made a tag synonym of "api key"? Should we just retag all the latter?
• Or are there really two different concepts?

Answer 1

Answer: Yes they are the same.
Officially now, since app-key was made a synonym of api-key.