Everyone who has Gmail/YouTube Account can create its own youtube channel which has a unique user ID and channel ID. These can be used on youtube apps and other services. Knowing what your YouTube User ID and Channel ID can be important in the social media and other services.
1. Login to your YouTube account (using Gmail Account).
2. At top right side, click the drop down menu.
3. Click YouTube Setting.
4. Click Advanced.
5. From there, you will see other settings including the YouTube User ID and Channel ID.
(Disclosure: YouTube, Info/Logo/Images/Video/Pictures stated above has a respective copyright. We used it for demonstration purpose only.)
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Related Links / Articles / Entries / References / Sources:
YouTube – Official Site

i give thanks for your info here. i didn’t about this. 😉
the idea of id is to share you’re youtube channel to everyone via you’re id. fantastic blog.