Guest host

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A guest host (or guest presenter in the United Kingdom) is a host, usually of a talk show, that hosts the program in lieu of the regular host if they fall ill, have another project or commitment, or are unable to host for some other reason.

Guest hosts may be seen as undesirable for a show's producer if they have to be used for an extended period of time, but if they do a well enough job, the guest host may often be able to parlay their run into their own talk show or other project.