The bar is the frame: health, names and state without a stack of borders around them.
Unit frames
Player, target, target of target, focus, pet and boss frames. Health as percent, value, both or none; a gradual low-health tint; incoming heals and absorbs; debuff-type borders and badges; raid target markers; offline state; adjustable size. Target and focus show buffs and debuffs apart, yours first.
Party and raid frames
Secure group frames for 5, 10, 20 and 40 players, with real-size previews in the settings. Debuffs you can remove show by type even in combat, with aggro, range fading, class-coloured names and sorting by role. Defensives and debuffs sit in their own groups beside each bar.
Defensives
NewA list you control of the buffs that count as defensives, every rank: Blessing of Protection, Shield Wall, Ice Block and more. They show beside party and raid frames, and the big ones mark the frame Warded, in combat too.
Buff indicators
Healer indicators per class and spec: icons, squares, borders or fills in any corner, shown while up or while missing, for your own group or the whole raid, per raid size.
Nameplates
Enemy plates with your debuffs, threat badges solo and in groups, casts with spell icon, target and interrupt state, quest objective marks and raid markers. Styled friendly plates in the open world.
Cast and swing bars
Your cast bar with its target; target, focus and boss casts that show whether you can interrupt them; and a swing timer that follows your cast bar.
Auras
Your buffs and debuffs, and your auras on other frames, drawn by the game itself so they stay correct in combat.