It grants you the power to harvest blocks that normally would be unobtainable or difficult to obtain. One advantage of the Silk Touch enchantment is having an increase in inventory yield. It will release the raw forms of Redstone and Lapis Lazuli, only releasing one item of these in ore block forms rather than releasing multiple drops of the ore blocks. Silk Touch also lets you obtain blocks that can't be obtained any other way in survival. In addition to the mining blocks listed above, Silk Touch can be added to shears, which allows you to obtain cobwebs found in abandoned mine shafts. This enchantment also allows a player to harvest ore blocks in dangerous situations (such as harvesting a Nether quartz ore in the Nether) and mine them in a safer situation at a later time. This enchantment only has 1 level.
See your progress in getting all the possible achievements from villagers.