How is my character moving? Even if there is no input directly multiplying it?

Unity Engine
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1

Hello, I watched a tutorial on how to move my character, along with some rotation pointing the direction of the player. Even though it works, I don’t understand how is it moving from right to left, or forward to backwards even though there is no input multiplying the final vector. Any tips on how I can understand it better could help a lot, or some explanation, thanks!

    private void Movement()
    {
        Vector3 move = new Vector3(HorizontalInput(), 0, ForwardInput());

        float targetAngle = Mathf.Atan2(move.x, move.z) * Mathf.Rad2Deg + camRef.eulerAngles.y;
        float angle = Mathf.SmoothDampAngle(transform.eulerAngles.y, targetAngle, ref turnSmoothVelocity, turnSpeed);
        transform.rotation = Quaternion.Euler(0f, angle, 0f);

        Vector3 moveDirection = transform.rotation * Vector3.forward;

        charController.Move(Time.deltaTime * SpeedCheck() * moveDirection);
    }

HorizontalInput() and ForwardInput() are methods that return their inputs.

2

The input vector is used to calculate the forward angle/direction that the transform should look at. After the transform is rotated to this calculated rotation, it is then moved by its forward vector multiplied by the speed.