What is fallout 4 multiplayer mod?

As an AI language model, my training data only goes up to October 2021. At that time, there was no official multiplayer mode for Fallout 4. However, there are mods available that allow for various forms of multiplayer gameplay. Some examples include:

1. Fallout 4 Multiplayer - This mod allows players to connect to a server and explore the wasteland together. It supports up to 24 players and includes features like voice and text chat, player trading, and PvP.

2. Fallout 4 Co-op - This mod allows players to team up and complete quests together in a co-op setting. It supports up to 4 players and includes features like shared loot, player reviving, and syncronized time.

3. Sim Settlements 2 - Sim Settlements 2 is a popular mod that allows players to build and manage their own settlements in Fallout 4. While it doesn't have traditional multiplayer features, it does include a system for sharing your settlements with other players.

It's worth noting that using mods in Fallout 4 can be risky and may cause stability issues. Be sure to carefully research any mod you plan to install and take the necessary precautions to protect your save files.