Relating WMS and HTTP

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I am a new to maps and related services for viewing it. My goal is to display maps on a website and provide several options to the user for interactivity , like overlaying layers on each other etc. GeoServer seems to the only and most promising option .There are certain things i am not able to understand completely.

How does WMS protocol fit with Http?When a browser sends a full WMS request to Geoserver, is this request an HTTP request? And when the geoserver returns a map , is this again an HTTP response ?

If these are both request and response are HTTP, then why do we need openlayers?



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