We need the ability to exchange data between items and store intermediate data.
Use cases:

• Storing and reusing credentials (tokens, keys, etc. if they change too often to be stored in a macro and rarely enough to be updated every time the script is executed)
• Storing intermediate results if the script runs for too long (for example, “continue from the last processed element”)
• Store and reuse functions (for example, functions for getting object properties, authorization, etc.)