You don’t normally think of your refrigerator as an appliance that would leak water but they sometimes do. Finding the source of the leak takes some investigation but it is relatively simple to do.
A very common problem is that the defrost drain could be blocked. The drain has a small opening that is easily clogged by food particles or ice. During the defrost cycle, water could build up and not be able to drain into the pan. The water would then leak out onto the floor. You can clear the drain by pouring hot water over it and using a stiff wire to remove the blockage if there is any.
Normally the drain pan is not the problem but it can develop a crack and that would allow water to leak. Only a small amount of water usually accumulates in the drain pan and not enough to overflow. This water evaporates, with help from the condenser fan, which blows warm air across the surface of the pan. Do a thorough examination of the drain pan looking for any damage or cracks. If the pan is damaged, replace it.
The water line connections to the ice maker can sometimes come loose or the seals can crack from age. The plastic hoses can crack, tear or get kinked which would cause pressure at the connection and cause a leak. The water line going to the ice maker is normally on the back, outside of the refrigerator. Check this line and its connections for any signs of moisture. If the ice maker supply line is the problem there will normally be water running or dripping down the line onto the floor. You should tighten all of the connections or replace the water line.
If your refrigerator has a filtering system the connection between the water filter and the water supply can cause a leak. The filter may have been installed incorrectly, wrong size or wrong model for the refrigerator. It’s also possible that it may be very old and the housing or seals are cracked, therefore allowing water to escape. Remove and replace the filter if you see water running down the outside of the filter and into the interior of the refrigerator. Make certain the filter is the one specifically for your model.