Basically is breaks blocks as they are. Dig a dirt block with grass on with a normal shovel and you end only get dirt but silk touch will break it with the grass still on. Same applies to things like picks, break a stone block and you get cobblestone but with silk touch you'll get a stone block. It has limited uses though as if you break ores like diamond, emerald or redstone you'll end up with the block (like you do for iron etc.) rather than the actual diamonds, emeralds or redstone dust.
Thanks man, not my house but I'm sure I can find them
Edit: I found them thanks. I built that house just for looks but it isn’t my actual house.