AI / Agentic AI Interview Questions
What are the types of memory used by AI agents?
Agent memory is generally split into a few distinct types, each serving a different purpose.
| Memory type | What it stores |
| Short-term memory | The active conversation and context within the current session, roughly equivalent to the LLM's context window |
| Long-term memory | Persistent knowledge from past sessions, often stored in an external vector database |
| Episodic memory | Specific past events captured with temporal information, letting the agent recall what happened and when |
Short-term memory disappears once the session ends unless it's explicitly written to long-term storage, which is why persistent agents need a deliberate mechanism for deciding what's worth remembering beyond the current conversation.
Which memory type roughly corresponds to the LLM's context window?
Which memory type is typically stored in an external vector database?
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