Inventory slots are a fundamental part of Minecraft. They define how many things the player can hold at one time, and are used to store items in the player’s inventory.
There are nine inventory slots in total. Players start with four inventory slots, and can gain additional slots by finding or killing monsters, or trading with other players.
When players lose an inventory slot, they can’t put any more items in that slot until they find or trade for a new one.
Players can also use commands to change the number of slots they have, or to remove all of their inventory and put everything into a container. This is useful for when players want to carry large amounts of items without having to worry about losing them.