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What is SIEM (Security Information and Event Management)?

A platform that collects, correlates, and analyzes security events from across an organization to detect threats and incidents.

SIEM systems aggregate logs from firewalls, servers, applications, and endpoints, then apply correlation rules to identify suspicious patterns. A single failed login is normal; 1000 failed logins across 50 servers in 5 minutes triggers an alert.

Features include real-time monitoring, threat detection, compliance reporting, forensic investigation, and incident response workflows. Popular solutions include Splunk, IBM QRadar, Microsoft Sentinel, and Elastic Security. SIEM is central to Security Operations Centers (SOCs).

Related Terms

Zero Trust
A security model that requires strict identity verification for every user and device, regardless of their network location.
SQL Injection
An attack where malicious SQL code is inserted into application queries through user input to access or manipulate the database.
Principle of Least Privilege
A security principle where users and programs receive only the minimum access rights needed to perform their specific tasks.
API Security
Practices and mechanisms for protecting APIs from unauthorized access, data breaches, and abuse.
OAuth 2.0
An authorization framework that allows third-party applications to access user resources without sharing passwords.
Data Loss Prevention (DLP)
A strategy and set of tools that detect and prevent unauthorized transmission of sensitive data outside an organization.
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