X-ray for Minecraft Bedrock 1.21.61 is a term used in Minecraft when a piece of software let's you see trough walls. This comes under the form of resource packs that change the opacity of natural blocks like stone so you can see ores, mobs, liquids...
To use Xray for Minecraft Bedrock 1.21.61, you will need to activate the resource pack once you brought it to the game. Then just go to a Minecraft world and turn off "Smooth Lightning" in the settings. You should be able to see ores and other blocks and entities.
Video made by Lyndrian, this is a how to download and install as well as a how to activate and use Minecraft Bedrock 1.21.61 X-Ray guide.