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 is 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 the second toughest being Bedrock.

Blocks
Natural	Air • Stone • Granite • Andesite • Diorite • Bedrock • Clay ( Terracotta) • Cobblestone ( Moss) • Cobweb • Dirt • Gravel • Coarse Dirt • Bone • Ice ( Packed • Blue) • Spawner • Sand ( Red) • Sandstone ( Red) • Obsidian • Snow • Sponge • Wet Sponge • Stone Bricks ( Cracked • Mossy • Chiseled) • Prismarine ( Dark • Brick) • Sea Lantern • Pumpkin • Bee Nest • Grass Path • Infested Block • Snowier Snow
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
Ore	Coal Ore • Diamond Ore • Emerald Ore • Gold Ore ( Nether) • Iron Ore • Lapis Lazuli Ore • Redstone Ore • Ruby Ore • Nether Quartz Ore • Ancient Debris
Mineral Blocks	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 • Block of Ruby
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
Trading/Bartering only	Crying Obsidian
Redstone/Travel	Button • Dispenser • Redstone Lamp • Door • Fence Gate • Lever • Note • Piston ( Sticky) • Pressure Plate • Rail ( Powered • Detector • Activator) • Redstone ( Wire • Torch • Repeater • Comparator) • Trapdoor ( Iron Trapdoor) • Trapped Chest • Hopper • Dropper • Daylight Detector • Tripwire Hook • Observer • Redstone Ore • Block of Redstone
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
Liquids	Lava • Water
Non-Solid	Fire ( Soul Fire) • Sign • Torch ( Soul Fire) • Banner
The Nether	Glowstone • Shroomlight • Netherrack • Nylium • Nether Brick ( Fence) • Nether Quartz • Nether Gold • Ancient Debris • Nether Wart • Nether Roots • Weeping Vines • Twisting Vines • Fungus • Soul Sand • Soul Soil • Basalt • Magma Block
The End	Dragon Egg • End Stone • Purpur( Purpur Pillar) • Endstone Brick • End Rod • Dragon Head • Ender Crystal
Creative only	Barrier • Structure Block • Jigsaw • Command Block ( Repeating • Chain)
Bedrock Edition only	Stonecutter (old) • Nether Reactor • Light Block • Glowing Obsidian
Technical	Piston Arm • Block 36 • Burning Furnace • Glowing Redstone Ore • Off-state Redstone Torch • Active Redstone Repeater • Flowing Water • Flowing Lava • Farmland • Pumpkin Stem • Melon Stem • Block 97 • Portal • End Portal Frame • End Portal • End Gateway (block) • Missing Texture Block
Unused	Locked Chest
Removed	Cog • Dirt Slab • Cyan Flower • Camera(BE) • Wax Block
Unimplemented	Crying Obsidian (old) • Wax Block
Education Edition only	Element Constructor • Material Reducer • Compound Creator • Hardened Glass • Border • Underwater TNT