Descripe what is web cache about secure computer network

1) descripe what is each topic about secure computer network and why its important?

2) describe these topics to somone that has no knowledge in computer networks to deliver the idea to him?

its only 6 topics I need it asap

-Application Programming Interface (API)
-Secure Socket Layer (SSL)
-HTTP with non-persistent connections
-HTTP with persistent connections
-Web Cache
-DNS Caching

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