Gauge theory is a way of understanding the universe around us. It's based on the idea that nothing in the universe is fixed. For example, the distance between two objects changes depending on where you measure it from.
A gauge is like a measuring tool. It's used to measure the amount of a certain property like distance or energy. In gauge theory, we use these gauges to measure different properties of the universe. We can then use these measurements to develop mathematical equations that describe how different properties of the universe interact with each other.
Gauge theory helps us understand how things in the universe are connected and how they change over time. It's an important part of modern physics and has helped us make predictions about the behavior of the universe.