Set Your Country Content Preference (What is this?)

Choose which country's videos, channels, and activity filters (for example, "Most Viewed"), you would like to view.

Set Your Language Preference (What is this?)

Choose the language in which you want to view YouTube. This will only change the interface, not any text entered by other users.
About YouTube
Reach Your Audience

Developer APIs

YouTube offers access to the YouTube video repository and community features via a GoogleData ("GData") API.

Legacy API Information

The older API is officially deprecated. If you're developing new projects on the YouTube platform, you should use the new API to ensure support.

See the migration guide for more information about updating websites or applications based on the legacy API.