Introduction
A processor is an electronic device that executes instructions to perform a specific task. Processors can be categorized into various types depending on their functionalities. One such type of processor is a coprocessor.

Explanation
A coprocessor is a secondary processor that is designed to supplement the processing power of the main processor. It is a specialized processor that is used to perform specific tasks that the main processor may not be able to handle efficiently. One of the common functions of a coprocessor is to perform floating-point calculations.

Floating-point calculations involve the use of numbers that have a decimal point. These calculations are often used in scientific and engineering applications that require a high degree of precision. Coprocessors are designed to handle these calculations efficiently, allowing the main processor to focus on other tasks.

Examples of Coprocessors
There are various types of coprocessors, including:

1. Math coprocessor: This coprocessor is designed to handle mathematical calculations, including floating-point calculations.

2. Graphics coprocessor: This coprocessor is used to handle the graphics processing tasks in a computer, including rendering 3D graphics and video playback.

3. Digital signal processor: This coprocessor is used to handle digital signal processing tasks, including audio and video processing.

Conclusion
In summary, a coprocessor is a specialized processor that is designed to supplement the processing power of the main processor. One of the common functions of a coprocessor is to perform floating-point calculations. Therefore, the correct answer to the question is option C (coprocessor).