rest webservices stateless and allow cache

i was reading below link
http://gopaldas.org/webservices/soap/webservice-is-stateful-or-stateless-rest-soap/

what it mean  by

rest web services stateless and allow caching
how stateless allows to cache webservice responses?
how caching is related to statelessness of http?
please advise
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gudii9Asked:
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Prashant SabnekarAVPCommented:
Hi gudii9,

HTTP is a stateless protocol but still we can maintain state by some techniques such as cookies, URL rewriting and hidden forms. See this link https://www.ntu.edu.sg/home/ehchua/programming/webprogramming/HTTP_StateManagement.html

Once you have the state then you can provide caching also.
Imagine a request made by a client for some service, the first time you do the processing needed to send the response but the next time you can skip that processing by maintaining a cache (provide the response still remains same).

Let me know if this clarifies your question or if you need any more clarification.

-prashant
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Prashant SabnekarAVPCommented:
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