Question

a is a simplified representation of a real object or system.

Explanation:

In various academic fields like Natural Science (e.g., physics models of atoms), Business (e.g., economic models of markets), etc., a model is used. A model simplifies a real - world object or system to make it easier to study, understand, and predict its behavior. It can be a physical model (like a globe representing the Earth), a mathematical model (equations representing a physical process), or a conceptual model (a flowchart of a business process).

Answer:

model