The ELK stack (Elasticsearch, Logstash, and Kibana) is a powerful suite of open-source tools for searching, analyzing, and visualizing log and event data. Elasticsearch serves as the scalable search and analytics engine, while Logstash processes and ingests log data from various sources. Kibana provides a web-based interface for querying and visualizing the data stored in Elasticsearch. The ELK stack is widely used for log management, real-time data analysis, and monitoring of infrastructure and applications. It enables developers to gain actionable insights from their data through customizable dashboards and powerful search capabilities.