InfluxDB is an open-source time-series database that offers a distinctive approach to handling large amounts of naturally ordered time-series data at scale. It seamlessly integrates with most programming frameworks and languages, providing well-designed query languages like InfluxQL and Flux, as well as the lightweight InfluxDB Line Protocol for fast data ingestion. Apache ECharts is an open-source JavaScript library used for rendering charts and graphs, particularly suited for mobile apps due to its low memory footprint. A basic React app can be set up with InfluxDB Cloud using the provided tutorial, which includes querying data from InfluxDB Cloud, writing Flux queries, creating a new API token, cloning a GitHub repository, and connecting to the database. The React app uses ECharts for React to plot charts and graphs, including line charts and bar charts, using sample data from an InfluxDB Cloud bucket.