Use cases
The application is the variable
The memory is not. Everything below is the same engine in a different mixture of the same five jobs — which is the whole reason it is infrastructure and not a feature.
Persistent memory
Preferences and corrections survive the session and the handoff.
Assistant agents
Agents that pick up where they left off
Commerce agents
Agents that remember what the customer actually responds to
AdTech
A person is not a thirty-day window
Games & multiplayer
Characters that remember the player between sessions
Data residency
The memory is the thing residency law is about
Valid time
Every memory carries when it was true and when you learned it.
Employee support
Agents that answer from the policy in force today
Contract & legal ops
Agents that can answer as of the date of the dispute
Financial ops
Agents that reconcile against the number that was true then
Capital markets
Agents that can show what was known at the time
Healthcare
Agents that know what was true at the encounter
Episodic memory
Action, reasoning and outcome stay attached to each other.
Shared memory
What one agent learns, the next one already knows.
Decision context
Selection weighs state, validity and relationships — not similarity alone.
Don’t see yours? It is probably one of the five.
The applications differ. The jobs underneath them do not. Tell us what you are building and which one it leans on.