For most plants, pollination is the stimulus for the beginning of fruit development. Continued fruit development usually depends on seed formation. Parthenocarpic fruit develop without fertilization and are seedless.
Two types are known. Vegetative parthenocarpy in crops like cucumber, pear, and fig take place even without pollination.
Stimulative parthenocarpy requires pollination but not fertilization. Grapes are an example this type of parthenocarpy.
Seedless cucumber is an example of vegetative parthenocarpy.