Compromised credentials
Passwords, keys or tokens that have fallen into the hands of someone they were not issued to. In cloud cost terms they often show up as a sudden spend spike in unusual regions or services, for example from crypto mining. The response is to revoke, replace, review what was touched, and contain the damage. Why it matters: A leaked key can run up a large bill within hours.
Read the term in context.
Each row is a lesson that uses this term. The lesson where it first appears is the canonical definition.