The vast majority of ceramic and porcelain tile does not need to be sealed. One of the best features of ceramic tile is that it is not porous like natural stones and hens doesn't absorb liquids and dirt that gets on the surface.
Now, what you might want to seal is the grout, some modern high quality grouts do not need to be sealed after application, however, this being a Villages house the grout used was probably just a standard builders grade grout and they probably did not seal it as its a very labor intensive project, you would typically apply the sealer with a brush or a sponge, let it sit for a minute or two and then wipe it off.
I would only seal the grout if it is a very bright color or if the grout and the tile are very different shades i wouldn't bother if its regular gray grout. You could seal only the high traffic areas like the entryway and the kitchen, where spills would happen. I have used and like the brand Miracle, their product called 511 impregnator sealer is good.
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