Splunk is a data analytics and observability platform for logs, metrics, and traces. It ingests machine data from applications, infrastructure, cloud services, and security tools; indexes it at scale; and lets you interrogate it with SPL (Search Processing Language) using a schema-on-read model. Beyond ad hoc searching and monitoring, Splunk powers real-time detection, historical analytics, dashboards, and automated actions, with major use cases in SIEM and security analytics.