Why is it necessary to transform data between cold and hot states?

Data transformation between cold and hot states is necessary for efficient resource management and application performance.

• Hot state — data and objects that are actively used and reside in memory, providing quick access.
• Cold state — data that is not currently in use and can be stored on disk or in a database, freeing up RAM.

This transformation helps to:

• Reduce memory consumption by unloading inactive data.
• Speed up application performance by keeping frequently used data in memory.

For example, in Android, when an app is minimized, UI data can be saved in a cold state (e.g., in a Bundle), and upon return, restored to a hot state for quick display.