Diference between SPSite and SPWeb

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SPSite
SPWeb
It is a Site Collection including top level site.
It is a specific website under Site Collection. It could be individual sub site or top level site.
SPSite is container that contains a single SPWeb (ex: SPSite.RootWeb), Top level site is referred as root web.

To return the current site collection use :
SPSite site = SPContext.Current.Site
To return the web site:
SPWeb web = SPContext.Current.Web
Few methods are  Dispose(), Close(), Delete(), GetChanges(), GetUrls() etc.
Few methods are Delete(),Dispose(), GetList(), GetListFromUrl() etc.

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