Verification badge on YouTube is a grey check mark or a grey music note depending upon your channel. It makes you a well-established channel on YouTube. Only a limited number of channels with a minimum of 1 million subscribers on YouTube can apply to get this special status. It is difficult to get a channel verification badge.
On the contrary, it is a basic requirement to get your YouTube channel verified to let YouTube know that you are an authentic YouTuber and not a bot. Anyone can get the channel verified using a mobile phone by receiving a verification code.