A conference badge is the credential an attendee wears onsite to show they are registered, carrying their name, organization and level of access.
A badge answers three questions at once. For staff it proves the wearer is registered and shows what they can access. For other attendees it supplies a name and an organization, which is the entire basis of hallway networking. For the organizer it carries a scannable code that turns physical presence into data.
The two get used interchangeably and they should not be. A ticket is the entry item someone selected at registration. A badge is the credential produced afterward, usually onsite. One registration can produce a ticket and a badge, and it is the badge that governs access on the day.
Name first and large. Organization second. Everything else is secondary, including the event logo, which organizers routinely oversize at the expense of the name. If the badge signals access level, use a cue that works from ten feet away: a color band along one edge beats a word in small type.
Badge designs are built in the platform and printed on demand when the attendee checks in, so the badge comes off the printer from the attendee's record at the moment they arrive rather than from a batch run days earlier. See badge printing.