YouTube HD videos back in India because of the coronavirus pandemic started Youtube announced the HD videos option back in India. Now YouTube videos on the mobile app are available to watch full HD and higher quality. It is suitable only while watching videos on the app using Mobile data and Wi-Fi viewing is still not allowed to SD quality. Only when connected to Wi-Fi, YouTube app now allows users in India to watch videos in HD quality.
The default setting of quality is set at 480p and now it shows the options for 720p, 1080p, and 1440p, along with the clarity 144p, 240p, 360p, and 480p. The option for HD quality comes only when the device is connected to Wi-Fi and if it is not then in mobile data return to 480p quality.
More information regarding YouTube HD:
This evolution is for all the YouTube users and not only for the people who are the YouTube Premium subscription holders. This means everybody can see the HD quality videos on the same application. The YouTube users who use Youtube on the desktop can stream videos in HD quality and the limitation is only executed for mobile application users.

The SD streaming limitation was executed before in march while the Corona Virus lockdown to save the high frequency. Not only YouTube but other sites like Amazon, Prime Videos, Disney+ Hotstar, and Netflix, they also have done the same.
It was said that YouTube will temporarily set to the SD quality at 480p on the mobile networks till 14 April. But this limitation will be will continue to the users of mobile.
A summary is given below of this topic: How to download YouTube videos for viewing offline
Youtube HD is a video streaming platform for everyone who has internet, it is a place where you can find out movie trailers, live events, tutorials, web series, comedy videos, songs and many more. As we all know that in some of the areas mobile data doesn’t work and also WiFi is not available, so in this type of situation, it is better to download or save the videos to watch offline.
The videos are allowed for the users to download it for their benefits, and strictly not for copyright issues. The video can only be downloaded only if the creator allows you. YouTube application supports both iOS and Android and also supports to download the video to view it later when there is no network connection.