A webpage is that u see through ur browser by scrolling ur window up and down. A website or web portal is composed of a group of webpages linked together.
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The term 'portal' is used to describe a website that acts as an entry point or gateway to an array of services or resources.
Obviously all sites can do this to some degree, but typically a portal will have a wide range of resources, usually including a search facility, directory of other sites, news, e-mail etc. portals can be general (eg Yahoo) or be specific to a particular industry, occupation or field of interest.