A more thorough explanation:

Definition: An apparatus is a machine or device that consists of fixed and moving parts working together to perform a specific function. It is one of the categories of inventions that can be patented.

Examples: Examples of apparatus include a printing press, a telescope, a microscope, a camera, and a computer.

For instance, a printing press is an apparatus that consists of fixed and moving parts such as rollers, plates, and ink. These parts work together to print text and images on paper. Similarly, a telescope is an apparatus that consists of lenses, mirrors, and a tube. These parts work together to magnify distant objects and make them visible to the human eye.

Overall, an apparatus is a complex machine or device that performs a specific function by combining various fixed and moving parts.