Barrier

The Barrier is an invisible block that can serve as a better alternative for bedrock, replaced by "Invisible Bedrock" (Bedrock Edition), as it is indestructible. When a player is in Creative and they are holding a barrier block in their hand, every barrier block placed will display a red circle with a slash since it's a client-side particle. The range of this effect is limited to the regular range of particles, and it only becomes visible to a player holding the barrier block. It has the characteristics of Bedrock, with a -1 hardness, but 3 points tougher than the former.

Obtaining

Like a few blocks, such as the command block, the barrier block can only be obtained via commands. By doing the command: /give @p minecraft:barrier <amount> (putting "minecraft:" is optional) will give a player the number of barrier blocks put in the command. Barrier blocks are unobtainable in Survival unless "cheats" are enabled and used.

Trivia

It is one of only three types of blocks that are invisible to a player in-game, the other blocks being air and structure void.
The barrier block can help a "map builder" "design" a world. For example, they can use the block to restrict players from entering a specific area unless a player is in creative mode.
It's one of the only transparent blocks in Minecraft.
This is the toughest block in Minecraft, with hardness and blast resistance slightly exceeding Bedrock.

Blocks
Natural	Air • Stone • Granite • Diorite • Andesite • Dark Stone • Unnamed Smooth Speleothem Block • Unnamed Marble Block • Geode Casing • Bedrock • Clay ( Terracotta) • Cobblestone ( Moss) • Cobweb • Dirt ( Coarse Dirt)( Azalea Roots) • Gravel • Bone Block • Ice ( Packed • Blue) • Spawner • Sand ( Red) • Sandstone ( Red) • Obsidian • Snow( Powdered Snow) • Sponge • Wet Sponge • Stone Bricks ( Cracked • Mossy • Chiseled) • Prismarine ( Dark • Brick) • Clay Pot • Sea Lantern • Pumpkin • Bee Nest • Crying Obsidian • Grass Path • Infested Block • Speleothems
Manufactured	Bookshelf • Bricks • Wool ( Carpet) • Concrete( Powder) • Conduit • Dried Kelp Block • Fence • Glass ( Pane) • Stained Glass ( Pane) • Glazed Terracotta • Hay Bale • Iron Bars • Jack o' Lantern • Ladder • Painting • Scaffolding • Slab • Smooth Stone • Cut Sandstone • Smooth Quartz • Smooth Red Sandstone • Slime • Snow • Stairs • Walls • Wood Planks • Wood • Beehive • Honey Block • Honeycomb Block • Polished Diorite • Polished Granite • Polished Andesite • Red Nether Brick • Quartz Bricks • Polished Blackstone • White Candle • Black Candle • Sculk Block • Sculk Chute • Sculk Trap • Sculk Growth • Painted Clay Pot
Ore	Coal Ore • Copper Ore • Diamond Ore • Emerald Ore • Gold Ore ( Nether) • Iron Ore • Lapis Lazuli Ore • Redstone Ore • Nether Quartz Ore • Ancient Debris
Mineral Blocks	Block of Copper • Block of Diamond • Block of Emerald • Block of Gold • Block of Iron • Lapis Lazuli Block • Block of Quartz • Block of Redstone • Block of Coal • Block of Netherite
Utility	Bed • Brewing Stand • Cake • Cauldron • Chest • Shulker Box • Crafting Table • Enchantment Table • Furnace • Jukebox • TNT • Anvil • Blast Furnace • Barrel • Bell • Campfire • Cartography Table • Composter • Fletching Table • Grindstone • Lantern • Lectern • Loom • Smithing Table • Smoker • Stonecutter • Target • Respawn Anchor • Lodestone • Lightning Rod
Redstone/Travel	Button • Dispenser • Redstone Lamp • Door • Fence Gate • Lever • Note Block • Piston ( Sticky) • Pressure Plate • Rail ( Powered • Detector • Activator) • Redstone ( Wire • Redstone Torch • Repeater • Comparator) • Trapdoor ( Iron Trapdoor) • Trapped Chest • Hopper • Dropper • Daylight Detector • Tripwire Hook • Observer • Redstone Ore • Block of Redstone • Sculk Sensor
Plants	Cactus • Dead Bush • Chorus Plant • Flowers • Wither Rose • Grass( Grass • Fern) • Leaves • Lily Pad • Melon • Mushrooms( Huge) • Mycelium • Podzol • Nylium • Pumpkin • Saplings • Sugar Cane • Vines • Cocoa Pods • Wheat • Log • Corals • Kelp • Sweet Berry Bush • Nether Roots • Fungus • Weeping Vines • Twisting Vines • Sea Pickle • Dripleaf Plant • Baby Dripleaf Pant • Moss Block • Moss Blanket • Hanging Azalea Roots • Glow Berry Vine • Spore Blossom
Liquids	Lava • Water
Non-Solid	Fire ( Soul Fire) • Sign • Torch ( Soul Torch) • Banner • Amethyst Crystal
The Nether	Glowstone • Shroomlight • Netherrack • Nylium • Nether Brick ( Cracked • Chiseled • Fence) • Nether Quartz • Nether Gold • Ancient Debris • Nether Wart • Nether Roots • Weeping Vines • Twisting Vines • Fungus • Soul Sand • Soul Soil • Basalt • Magma Block • Blackstone
The End	Dragon Egg • End Stone • Purpur( Pillar) • Endstone Brick • End Rod • Dragon Head • Ender Crystal
Creative only	Barrier • Structure Block • Structure Void • Jigsaw • Amethyst Geode • Farmland • Spawner • Command Block ( Repeating • Chain)
Bedrock Edition only	Stonecutter (old) • Nether Reactor • Glowing Obsidian • Light Block • Border • Allow • Deny
Technical	Piston Arm • Block 36 • Burning Furnace • Glowing Redstone Ore • Off-state Redstone Torch • Active Redstone Repeater • Flowing Water • Flowing Lava • Pumpkin Stem • Melon Stem • Block 97 • Portal • End Portal Frame • End Portal • End Gateway (block) • Missing Texture Block
Removed	Cog • Dirt Slab • Spikes • Shrub • Rose • Locked Chest • Generic Dead Coral Block • Cyan Flower • Camera^(BE) • Wax Block • Buttercup Flower
Unimplemented	Crying Obsidian (old) • Wax Block
Education Edition only	Element Constructor • Material Reducer • Compound Creator • Hardened Glass • Hardened Glass Pane • Underwater TNT • Underwater Torch • Colored Torch • Element Lead

Obtaining

Trivia

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