This was bound to happen. Handles, something that most users are probably familiar from other social networks (like Twitter, Instagram and TikTok), have -finally- arrived at YouTube. These have already been rolling out for several weeks already according to YouTube. Your handle is unique to your channel and will be how people mention you in comments, community posts, and more.
You can easily chose you handle by going to https://www.youtube.com/handle. If you already have a personalized URL for your channel, then in most cases, YouTube automatically reserved this for you as your handle so you're all set. If you’re not happy with that handle though, you can change it and select a different handle by using the link above as well.
According to YouTube's Official Blog, "Handles will appear on channel pages and Shorts, so they'll be instantly and consistently recognizable. It’ll soon be simpler and faster to mention each other in comments, community posts, video descriptions and more. For example, creators can be shouted out in a mention in comments or tagged in the title of a recent collab, helping them increase visibility and reach with new audiences."
Want to know more? Watch this video from YouTube: