The 2025 SIEM buyer's guide emphasizes the importance of selecting a Security Information and Event Management (SIEM) system that is equipped for the AI era, addressing the vital role SIEMs play in contemporary Security Operations Centers (SOCs). The guide provides insights into crucial features and questions to consider when engaging with vendors, aiming to ensure that organizations choose a solution that will strengthen their security programs long-term. It raises considerations such as the impact of cloud transformation on visibility, the time required for developing custom data integrations, and strategies to minimize vendor lock-in. The guide also includes additional resources, such as Elastic Security for SIEM and security analytics, to aid in modernizing and optimizing security operations.