Summarize this article in one sentence.
The video should begin playing. scroll down  below the thumbnail of the video and select the best possible quality HD 720 video for video download,if you want to download audio just choose the audio quality option audio only.Click Download. It is the green button beside the quality.     {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/d\/df\/Choose_video_audio_quality.png\/459px-Choose_video_audio_quality.png","bigUrl":"\/images\/thumb\/d\/df\/Choose_video_audio_quality.png\/728px-Choose_video_audio_quality.png","smallWidth":460,"smallHeight":150,"bigWidth":"728","bigHeight":"238","licensing":"<div class=\"mw-parser-output\"><p>Image by: Uploader<br>\nLicense: <a rel=\"nofollow\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by\/3.0\/\">Creative Commons<\/a>\n<\/p><\/div>"}

Summary:
Go to the video you want to download. Choose the video or audio quality you want. Your video or audio will begin downloading onto your computer.