it's not rocket science

The phrase "it's not rocket science" is an idiomatic expression used to indicate that something is not overly complicated or difficult to understand or accomplish. It implies that the task or concept being referred to does not require specialized knowledge or advanced skills similar to those needed for the field of rocket science, which is often considered highly complex. It is often employed to emphasize simplicity, as if to say, "It's not as complicated as you might think."