Ruby Time Series Database is an open source library, which provides the functionality of time series database. It is used to store and access a huge amount of data and make it available to users. Time series databases are a special type of database designed to store and retrieve data that varies over time. A time series is a set of values indexed by date or time. Time series databases are used for applications such as logging, performance monitoring, real-time analytics, and financial analysis. Time series databases are a type of NoSQL database that is optimized for high performance, low latency queries on event data. Developers tend to use some of the following Ruby Time Series Database open source libraries are: prophet-ruby - Time series forecasting for Ruby; rollup - Rollup timeseries data in Rails; chef-prometheus - Chef cookbook.