'welcome_panel'action which is added for it.
Why We Need To Remove Welcome Panel in WordPress?
Welcome panel meta box is usefull for helping beginners find their way around WordPress.but when you become familiar to WordPress this panel become useless for us.
Having this welcome panel on the screen, pushes down other important dashboard metaboxs and make them less noticeable.
We can remove it by unchecking welcome checkbox from screen options.
But if you want to completely remove the welcome panel even from the Screen Options, then this is also possible.
This code simply removes the hook which that adds the welcome panel to the admin dashboard.