How to download videos from website?

Videos are good contents on website that is used to explain something clearly. And some website contains just songs, videos. If users want to download videos from the website, there is need of some downloading software. But it will be easy method having extension on browser that can download video.
Among many tools, flashvideo downloader is one. It allows videos to be downloaded on different formats and sizes.
Youtube downloader also helps to download.
There are other such helping tools.

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