Category of Data

Term	Access Frequency	Latency	Storage Layer	Typical Use Case
Hot Data	Very frequent	Very low	Cache, RAM, CPU cache	Recently accessed user sessions, counters
Cold Data	Rare/infrequent	High	Disk, archive, remote	Old logs, user history, old orders
Persisted Data	Durable, long-term	Varies	Disk, SSD, databases	Durable state, critical records