What is the point of an observer in Minecraft?

What is the point of an observer in Minecraft? In Bedrock Edition, an observer acts as a block update detector and detects anything that causes a block update. The causes and propagation of block updates are different between Java Edition and Bedrock Edition. As a result, each can detect some kinds of changes that the other cannot.

In Bedrock Edition, an observer acts as a block update detector and detects anything that causes a block update. The causes and propagation of block updates are different between Java Edition and Bedrock Edition. As a result, each can detect some kinds of changes that the other cannot.