Prometheus is an open-source monitoring and alerting toolkit designed for reliability and scalability. It collects and stores metrics as time series data, providing powerful query capabilities through its PromQL query language. Prometheus is highly modular, with a multi-dimensional data model and flexible architecture that supports various data sources and integrations. It includes built-in support for service discovery, automatic scaling, and alerting, making it well-suited for dynamic and large-scale environments. Prometheus is widely used for monitoring cloud-native applications and infrastructure, providing real-time insights and alerting capabilities to maintain system health and performance.