What is the function of the great sphinx of gizeh?

We are just not certain|||The sphinx is a guardian of the 2 worlds...just like cerebus for greeks the 3 headed dog....i belive they built that just like how we have our statue of liberty its a symbol of this and will always be there to remind people.|||the pharoahs used to beleive that the sphinx will protect them..that's why it's got a body of a lion and the head of a man...the bofy of a lion for strength..and the head of the man for intelligence..so it can be a good protector|||protection