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Tab bar
A row of icons at the bottom of a mobile app.
A tab bar is the row of three to five icons sitting at the bottom of a mobile app. Each icon represents a major section — Home, Search, Profile. Tapping one switches the entire view.
Tab bars are easy to reach with a thumb, which is why iOS and Android put them at the bottom. Limit to five items; more than that and the icons get too small to tap reliably.