SIEM, or security information and event management, is a platform that collects and correlates logs from many systems to detect threats. It also supports investigations and compliance reporting.
An audit trail is a chronological, tamper-resistant record of who did what, when and to which data or system. It lets organisations reconstruct events, prove compliance and investigate errors, fraud or security incidents.
Observability is the ability to understand what a running system is doing, and why, from the data it emits. That data is mainly logs, metrics and traces, which let engineers answer new questions without shipping new code.
Incident response is the planned process an organisation follows to detect, contain, investigate and recover from a security incident. It ends with lessons that strengthen defences.
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