A stateless application component does not save client state on the server between requests; each request is independent of the others, and the server does not retain session information. This is the hallmark of stateless design, making it easy to scale horizontally by adding more servers. A stateful component would retain session state information between requests, which can complicate scaling due to the need to either persist session state or maintain session affinity. Stateless components generally do not require sticky sessions since each request is self-contained and can be processed by any available instance.
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