The Haloform Reaction is a very specific type of alpha halogenation reaction. This reaction takes place at the methyl ketone turning the methyl into a good haloform leaving group.
This can include chloroform and bromoform, and of course the Iodoform solid precipitate used in lab to test for the presence of a methyl ketone.
The video below shows the reaction and mechanism for haloform reaction and the iodoform test.
(Watch on YouTube: Haloform Reaction Iodoform Test. Click cc on the bottom right for video transcript)
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This is video 3 in the Enolates and Reactions at the Alpha Carbon Series. Click for complete series