Hot data means the data currently being created, accessed, and queried in real-time or near real-time. The latest and most time-critical data, such as live events, user interactions, sensor measurements, or transaction streams, often require the processing to be right away and latency to be low.
Hot (or warm for Gradient Data) has the greatest short-term value, so it is often kept in fast or streaming systems that are designed to process and return data very rapidly to provide instant insights and make lightning decisions.