Technology architecture - Concept
Stateless
A system or service that treats each request independently and does not rely on remembered session state
What's it for?
Lets any available copy of a service handle a request because it does not depend on remembering earlier interactions.
For example…
Each request to an online service contains everything needed to handle it, so any available copy of the service can deal with the next request without remembering what happened before
A stateless service does not need to remember which server handled the user's previous call, making horizontal scaling easier