The year 2021 was a significant one for YouTube, with the platform seeing a number of high-profile events and milestones. Here are some highlights from the year:

1. The launch of YouTube Shorts: In June, YouTube announced the launch of Shorts, a new feature that allows users to create short videos that can be shared on the platform. The shorts were well-received by users and helped to boost engagement on the platform.

2. The rise of TikTok: While YouTube has always been a dominant force in video sharing, it's clear that TikTok is quickly gaining traction. In November, TikTok surpassed YouTube as the most-viewed app globally, according to App Annie. This is likely due to the popularity of features like Reels, which allow users to create short videos.

3. The release of YouTube Kids: In December, YouTube released YouTube Kids, a dedicated kids' app that offers curated content and parental controls. The app was well-received by parents and children alike, and helped to cement YouTube's position as a trusted source of entertainment for families.

4. The success of creators: In 2021, YouTube saw a number of notable creators achieve success, including PewDiePie, who became the first creator to reach 100 million subscribers on the platform. Other popular creators include Jordan Harbinger, Casey Neistat, and Rich Roll.

5. The growth of YouTube Gaming: As gaming continues to grow in popularity, YouTube has become a key destination for gamers. In 2021, YouTube Gaming saw record-breaking viewership numbers, with over 2 billion hours watched across the platform.

Overall, 2021 was a successful year for YouTube, with the platform continuing to evolve and adapt to changing user preferences. Looking ahead to 2022, we can expect to see even more innovation and growth from YouTube, as the platform seeks to remain at the forefront of the video-sharing industry.