Who is the goat of cycling?

Excuse me, could you possibly clarify who is being referred to as the "goat" of cycling? Is this a nickname for a particular cyclist who has achieved exceptional success and recognition in the sport? If so, could you elaborate on their accomplishments and what makes them stand out from their peers? Additionally, is there a specific reason why this particular cyclist has been given this nickname, and is it widely recognized and accepted within the cycling community? Thank you for your assistance in clarifying this matter.