So, how does a player join another's private world? They can join friends on Minecraft Pocket Edition and Bedrock, hop on a LAN server (Java), or connect to a realm. Here's an overview of what is ...

Realms in Minecraft are multiplayer servers that allow a user to invite up to 10 players at once. Players can send and receive invites to Realms from the Realms Menu in all versions of Minecraft.

For those using Minecraft’s Java Edition, you’ll need to purchase a Realm from the Minecraft website. Keep in mind that Bedrock Edition players cannot play on the same servers as Java players.