The SIEM market today is nearly a $2 billion industry, with players that can only be described as thriving. The first SIEMs crawled out of the sea as the descendants of a variety of different security technologies: log management systems (LMS), security log/event management (SLM/SEM), security information management (SIM), security event correlation (SEC), and many others. The earliest incarnations were rather limited. In their infancy, they struggled to scale across large campuses and companies, and were often excruciatingly slow to deploy.”]
Source: https://www.csoonline.com/article/3241808/its-not-your-parents-siem.html