A Roblox Display Name means that as well as customizing the appearance of your avatar, you can also determine what name is seen by other players and will appear in different areas of the game too.

How to craft 'Roblox' characters.Once you make it to the "Avatar Editor" screen, you'll be able to choose from several options that let you customize your avatar's clothing, accessories, body, and ...

Steps for altering your avatar’s appearance in every Roblox experience, from adding and removing items to changing your skin ...

The process for changing your display name on Roblox is fairly simple. Here's a full breakdown of how you can change your display name in Roblox.