Summarized distinction between theft, extortion, robbery and dacoity are as follows:

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TheftExtortionRobberyDacoity
Movable property is taken away without owners consent in theftConsent of the person is obtained wrongfully by coercionThe offender takes property without consent, robbery being the aggravated form of theft or extortionThere is no consent or it is obtained wrongly
Theft is of movable property onlyIt may be movable or immovable propertyRobbery may be committed in respect of immovable property where it is in the form of extortion, but not otherwiseDacoity may be committed in respect of immovable property where it is in the form of extortion but not otherwise
It can be committed by one personIt can be committed by one or moreIt can be committed by one or more personsTo commit the offence of dacoity, there must be at- least five persons or more
There is no element of force or compulsionForce or compulsion exists in extortion, the person being put in fear of injury to himself or to any other personsForce may or may not be usedForce may or may not be used
Element of fear is absentElement of fear is presentElement of fear exists if robbery is a form of extor­tion, otherwise notElement of force exists in dacoity
Thee is no delivery of property by the victimThere is delivery of propertyThere is no delivery of property in robbery if theft is committed in the course of robberyThere is no delivery of property in dacoity if theft is committed in the course of dacoity
Punished with imprison­ment of either description for a term which may extend to three years, or with fine or with both (Section 379)Punished with imprison­ment of either description for a term which may extend to three years, or with fine, or with both (Section 384)Punished with rigorous imprisonment for a term which may extend to ten years, and shall also be liable to fine; and if the robbery be committed on the highway between sun­set and sunrise it may be extended to fourteen years (Section 392)Punished with imprisonment for life, or with rigoro us imprisonment for a term which may extend to ten years, and shall also be liable to fine (Section 395)