Glass is a transparent block that can be crafted by smelting sand in a furnace. It allows light to pass through and offers players the ability to see outside their structures without exposing themselves to environmental dangers. Fragile and easily broken, it can be collected only with a tool enchanted with Silk Touch; otherwise, it shatters into nothing. Glass panes, a thinner version, can also be created from glass blocks for more intricate building designs.
The numerical item ID for Glass is 20
Numerical item IDs will only work in Minecraft versions below 1.13.
The item ID for Glass is minecraft:glass
This is the spawn command to give yourself Glass in Minecraft which includes the Minecraft /give command. If you are using the Essentials plugin you will need to use /minecraft:give instead of /give