1. As a proper noun: "Polaroid" refers to a specific type of instant camera and film developed by the Polaroid Corporation. It's essentially a brand name.
2. As an adjective: "Polaroid" can be used as an adjective meaning relating to or characteristic of the Polaroid instant camera or film. For example: "He took a Polaroid picture of his friends."
It's important to note that the word "Polaroid" is now a generic trademark. This means that it's no longer exclusively owned by the Polaroid Corporation and can be used to refer to any type of instant camera or film, even those made by other companies.
However, the original Polaroid cameras and film are still considered iconic and are highly sought after by collectors.