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These methods return a file extension to use when creating vector/raster outputs (e.g. "tif"). Generally, it is preferable to use the extension associated with a particular parameter, which can be retrieved through QgsProcessingDestinationParameter::defaultFileExtension(). However, in some cases, a specific parameter may not be available to call this method on (e.g. for an algorithm which has only an output folder parameter and which creates multiple output layers in that folder). In this case, the format returned by this function should be used when creating these outputs. It is the algorithm's responsibility to check whether the returned format is acceptable for the algorithm, and to provide an appropriate fallback when the returned format is not usable.