InfluxDB's Flux is a data-processing and querying language used for time series data analytics, offering capabilities similar to SQL but also built-in analysis and data science features. It can be used through the browser, Visual Studio, or command line, with no extra installation required. Flux queries allow for data cleansing and normalization, standardizing search tags, and calculating metrics such as successful writes and percentage of "ok" points. Larger ranges can be queried using aggregateWindow(), enabling faster results and easier readability. Downsampling can reduce raw high-precision data to lower precision aggregates, making analysis on smaller datasets possible. Alerting capabilities allow for filtering down specific fields, determining quantiles, and setting alert types and levels, enabling real-time reactions to critical data points.