Minecraft wiki entry for Command_Block, associated text: A command block can execute commands when activated by redstone power. It always has permissions of 2 level‌[Java Edition only]/1 level‌[Bedrock Edition only], so it can be used to allow a specific use of a command by players who can't use that command in general (for example, allowing anyone to obtain a specific item with /give without allowing everyone to /give themselves whatever they want).