The function of a Flip Flop in circuits is to:

A Flip Flop is a fundamental building block in digital electronics, primarily used for storing binary data. It is a bistable device, which means it has two stable states that can represent the binary digits (0 and 1). When a Flip Flop is triggered, it can change its state and thus hold a piece of binary information. This storage of binary data is essential for various applications, such as memory elements in registers, latches, and even in more complex circuit designs like counters and shift registers.

In a digital circuit, the ability to maintain its state until it is intended to change makes Flip Flops invaluable for synchronous systems where data integrity and timing are crucial. They do not perform arithmetic operations like addition or multiplication, nor do they store decimal data, which is typically represented in binary form anyway. Therefore, the primary function of a Flip Flop is indeed to store binary data, which aligns perfectly with the provided answer.