Gloria Do you mean the grout? In between the tiles?. If so there is grout sealer that you can brush on. As far as Tile, they are on sealed or clay tiles you have to buy a commercial grade sealer for that. If they are glazed tile’s meaning they have a shiny surface already you don’t seal those as they are already sealed
This product seals and works really well: https://amzn.to/2lmuIYr
You can buy tile grout sealer at any tile store or large hardware stores. There,are several out there. Read the labels to see which one works for you. I apply once a year or after a deep hard clean - like after scrubbing with scrub brush and bleach . They say that last 3 to 5 years but in heavy used and cleaning areas like a shower or kitchen counter tops, usually a year. Really easy brush or wipe on, wipe off. Goes a long way.
You get what you pay for. I use Pro Choice Sealer.
Tile & Grout Sealers - Sealers - The Home Depot
Shop our selection of Tile & Grout Sealers in the Flooring Department at The Home Depot.