The Observer is a block that detects changes in the environment, such as block updates or changes in a block's state. It functions by emitting a redstone signal when the face of the Observer detects this change, effectively acting as a sensor. This allows for the creation of intricate redstone contraptions, including automated farms, traps, and complex machinery, by providing a means to synchronize actions based on environmental activity.
The numerical item ID for Observer is 218
Numerical item IDs will only work in Minecraft versions below 1.13.
The item ID for Observer is minecraft:observer
This is the spawn command to give yourself Observer 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