In Minecraft Java Edition, players can either jump into a world on their own and explore it, or they can join their friends in a multiplayer world and play together.

To invite your own friends to join your Realm, the process is different for Java and Bedrock. How to invite friends to a Realm in Java To invite friends to your Realm in Minecraft Java, you should: ...

Minecraft players connecting with others in 2021 #1 - Java To join another player's world on Java edition, which is for PC, the host must open their world to LAN.