InfluxDB is an open-source time-series database designed for storing and querying high-volume time-stamped data. It is optimized for applications that require real-time analytics and monitoring, making it ideal for use cases like IoT, application performance monitoring, and sensor data analysis. InfluxDB's powerful query language, InfluxQL, allows for complex queries and aggregations over time-based data. It also supports data retention policies, downsampling, and continuous queries, providing efficient data management at scale. With its easy-to-use API and integration with Grafana, InfluxDB is a popular choice for developers working with time-series data.