Water is leaking in between the toilet and the floor. What can cause this
And how can I fix it ?

Water is leaking in between the toilet and the floor. What can cause this
and how can i fix it ?

If you mean it's coming out from underneath the bowl then first check the closet bolts, if they're loose snug them up. If they're tight then the wax seal's ruptured and the toilet has to come up, a new wax seal installed and the toilet reset. Good luck, Tom