Final answer:
The Roomba is seeking a dust bunny, which is a tangled ball of hair and debris that can harbor dust mites, tiny allergen-producing pests related to spiders.
Step-by-step explanation:
The Roomba is on the hunt for what is commonly known as a dust bunny. A dust bunny is a loose, tangled ball of hair or debris that accumulates under furniture such as couches.
These dust bunnies can contain many allergens and pests, including the common dust mites. Dust mites are relatives of spiders and are so small that they are barely visible without magnification. Despite being tiny, they feed on organic material and are prolific in number, with potentially thousands being present in just one gram of dust.
While thorough cleaning cannot eliminate them entirely, it is essential in reducing their population and allergens that can trigger asthma attacks.