Chunk borders are invisible lines that divide the world of Minecraft into 16×16 block sections. They are useful for understanding the layout of the world and for finding specific locations. By default, chunk borders are not visible in Minecraft Bedrock Edition, but there is a way to show them.
To show chunk borders in Minecraft Bedrock Edition, you need to use a third-party app or mod. There are many different apps and mods that can do this, but one of the most popular is called “Chunk Borders”. This app is available for free on the Google Play Store and the Apple App Store.