The method of tile removal depends on what's under the tiles. If there's a cement board or wood underneath, then it's possible to pry it up together with the tiles attached to it. Tile on a concrete floor requires removing the tiles with a chisel.
A jackhammer with chisel point or an electric tile stripper make the removal of tiles from the concrete more efficient, especially in larger rooms. A chisel also serves to scrape off the adhesive used to attach the tiles to the floor.
Removing tiles raises dust and shards of broken tiles may be sharp. Safety glasses, a dust mask, gloves and appropriate clothing help to prevent injury of the worker.