Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

an aloha shirt (also known as a hawaiian shirt) is a type of shirt that comes from hawaii.
aloha shirt

vichy is a "commune" in central france, in the auvergne-rhône-alpes region, along the allier river.
vichy

a webcam is a video camera that connects to a computer, and can let people see each other over the internet.

webcam