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And this brings another problem: Because of this, many of the ways to download YouTube videos that you'll find online are fairly dangerous as they're riddled with spamware and shady ads.

Our guide will teach you how to download YouTube videos on PC, iPhone, iPad, Android, and Mac, and educate you on the ethics of doing so.

Learn how to optimize your videos for better ranking on YouTube. Drive brand awareness, engage your audience, and unlock new revenue streams with an effective video strategy.

“The most-watched YouTube videos of 2010 reflect the people, places and events that captured our attention and imagination throughout the year,” said Mia Quagliarello, YouTube Community Manager.

In the past decade-plus, YouTube has seen billions of views for some of the videos shared on it. Here are the 10 most-viewed YouTube videos.