If you don’t like the look of grout lines and you want to achieve a cleaner and possibly more modern look, you can place tiles right up against each other and avoid using grout lines completely. \
While it is possible to place tile without using grout lines, it is not recommended. Moisture will get into the cracks between tiles and cause warping and damage and can, in time, make tiles look crooked and not well placed. \
There’s a reason that using grout is the standard when placing tile. Using grout results in a cleaner and much more durable design in the end, though it does take longer to place grout when laying tile. \