What Is a Username? Username vs Display Name vs Email

A username is the name an account is known by on a website or app. It is how the service tells your account apart from everyone else's, and on most social and gaming platforms it is also how other people find you.

That sounds simple, but sign-up forms make it confusing. One site asks for a username, the next wants an email, a third shows you a "display name" field and a fourth assigns you a number. This guide sorts out what each one means, with examples from platforms you probably use.

What is a username, exactly?

A username (also written user name) is a unique, text-based identifier for an account. Two things define it:

• It is unique on that platform. Only one account can hold a given username at a time. That is why you see "this username is taken" messages.
• It is chosen by you. Within the platform's rules, you pick it, unlike a numeric ID the system assigns.

Depending on the site, a username might be used to sign in, to build your profile address (like instagram.com/yourname), to let people mention you with an @, or all three. Some services call it a handle, a screen name, a gamertag or an online ID. They are all usernames with different branding.

Each platform also sets its own rules. Discord usernames are 2 to 32 characters, lowercase, with letters, numbers, periods and underscores. Roblox usernames are 3 to 20 characters with at most one underscore. Instagram caps them at 30 characters. The platform checker pages list the rules for each site.

Username vs account name

"Account name" means different things on different services, which causes a lot of confusion.

• On many sites, account name is simply another word for username.
• On Steam, it is a separate, private name you use only to sign in. Steam says it cannot be changed, and other players never see it. What they see is your profile name and, if you set one, your custom URL.
• On Google and Microsoft, your account name is effectively your email address.

When a login screen asks for your account name and you are unsure, try your email address first, then any handle you remember using on that site.

Username vs display names

This is the distinction that matters most on social and gaming apps. A display name is the label shown on your profile and next to your posts. A username is the unique identifier underneath it.

	Username	Display name
Unique?	Yes, one account per name	Usually no, many people can share one
Used to find or tag you?	Yes	Rarely on its own
Changing it	Often limited or paid	Usually free and quick
Can include spaces and emoji?	Usually not	Usually yes

Real examples: on Roblox, changing your username costs Robux, while your display name is free to change and does not have to be unique. On Discord and X, the bold name at the top of a profile is the display name and the handle beneath it is the username. On Steam, the profile name friends see is a display name in all but title, since many players can use the same one.

The practical takeaway: when you want someone to add you, give them your username, not your display name. "Add me, I'm Nova" might match dozens of accounts. "Add nova_builds" matches one.

Username vs email vs ID

Three identifiers often sit behind one account:

• Username: chosen by you, usually public, sometimes changeable.
• Email address or phone number: private, used to sign in and recover the account. Many services, such as Google, Microsoft and Apple, use the email itself as the login, so there is no separate username at all.
• User ID: a number or code the system assigns and you rarely see. It stays the same when you rename. Xbox, for example, gives each account a numeric ID called a XUID behind the gamertag, and Steam assigns every account a SteamID.

This is why a rename does not break your friends list on most platforms. The service tracks you by the hidden ID, and the username is just the current label on top.

A security point worth remembering: your username is usually public, your email is semi-private, and your password is never shared with anyone. No legitimate support agent will ask for your password or a one-time login code.

Nicknames and "Google, what is your nickname?"

A nickname is a looser idea: what an app or assistant calls you. It is not a login and is rarely unique.

A common example is Google Assistant. People ask "Hey Google, what is my nickname?" or type "google what is your nickname" because the assistant greets them by a name they did not expect. By default, that nickname is the first name on your Google Account, but you can change it. Google's help page on changing what Google Assistant calls you explains the steps: on an Android phone, say "Hey Google, open Assistant settings", then go to Basic info and Nickname. You can also spell out how it should be pronounced.

Changing that nickname does not change your Google username, which is still your Gmail address.

How to find your username

If you have forgotten yours, try these in order:

1. Check a device that is still signed in. Your username is usually at the top of the profile or account screen.
2. Look in your password manager or browser's saved passwords. The username is stored next to each password.
3. Search your inbox for the site's name plus "welcome" or "verify". Sign-up emails often include the username.
4. Use the site's own recovery link, usually labelled "Forgot username?" on the sign-in page.
5. Try signing in with your email or phone number, since many sites accept those instead.

Our full guide, what is my username?, has platform-by-platform steps for Google, Microsoft, Apple, Instagram, Reddit, Steam and more.

If you remember a few likely handles but not which site you used them on, test them. The WhatsMyName Apps username search checks up to five names across 3,165+ sites and shows the public display name and avatar where a profile exists, so you can spot your own account. It is free, needs no sign-up and does not store what you type. A Found result means a profile with that name exists, not that it is yours, so open it and check.

Choosing a username

If you are picking a new one, a few rules save trouble later:

• Make it easy to say and spell, so people can find you from hearing it once.
• Leave out your birth year, full name, school or street.
• Avoid characters some platforms reject, such as spaces, dots or more than one underscore, if you want the same name everywhere.
• Check it on every site you care about before you claim it on any of them.

The name checker shows whether a name is free on 24 popular platforms and as a domain, and our guide to choosing a unique username covers the process step by step. If your first choice is gone, see what to do when a username has been taken.

FAQ

Is a username the same as an email address?

Not always. Some services use your email as your username, while others have a separate public handle and use your email only for sign-in and recovery.

Can two people have the same username?

Not on the same platform. Usernames are unique per site, though the same name can belong to different people on different sites. Display names, by contrast, can usually be shared.

Is "user name" or "username" correct?

Both appear, but "username" as one word is the common form on websites and apps.

Should my username be my real name?

For professional profiles like LinkedIn or GitHub, a version of your real name helps people find you. For gaming and casual apps, a handle without personal details is safer.