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A histogram is a lot more than a bar chart! In a histogram, the area of the bar, NOT its height, is proportional to frequency. Bars do not have to be of equal width. The height of each bar is called the frequency density.
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This question appears in the following syllabi:

SyllabusModuleSectionTopicExam Year
AQA AS Maths 2017StatisticsData Presentation and InterpretationHistograms-
AQA AS/A2 Maths 2017StatisticsData Presentation and InterpretationHistograms-
AQA GCSE (9-1) Higher (UK)S: StatisticsS3: Grouped Data, Histograms and Cumulative FrequencyHistograms-
CBSE IX (India)StatisticsDisplaying DataHistograms-
CIE IGCSE (9-1) Maths (0626 UK)9 StatisticsB9.4 Graphical RepresentationsHistograms-
Edexcel AS Maths 2017StatisticsData Presentation and InterpretationHistograms-
Edexcel AS/A2 Maths 2017StatisticsData Presentation and InterpretationHistograms-
Edexcel GCSE (9-1) Higher (UK)S: StatisticsS3: Grouped Data, Histograms and Cumulative FrequencyHistograms-
GCSE Higher (UK)StatisticsDisplaying dataHistograms-
OCR AS Maths 2017StatisticsWorking with DataHistograms-
OCR GCSE (9-1) Higher (UK)12: Statistics12.02b: Grouped DataHistograms-
OCR MEI AS Maths 2017StatisticsWorking with DataHistograms-
Universal (all site questions)DDisplaying dataHistograms-