The layer below tile is called cement board and it comes in 3' by 5' sheets. It is a combination of cement and reinforcing fibers and has the added advantage of being mildew resistant. It can be nailed or screwed to the floor. Since I have an abundance of drywall screws, we opt to screw the sheets down. Because of the application, each screw needs to be countersunk, which means the top of the screw head is below the top of the sheet rock. Since we are going install tile over this, we don't want little bumps or uneven tile as a result of the screws. We are liberal with the screws, especially compared to those overzealous installers of the previous cement board.
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