Modded Minecraft Servers
Modded servers use custom mods and modpacks to expand Minecraft in ways not possible on regular plugin-based servers. These servers add a wide range of new blocks, items, biomes and gameplay mechanics that can completely transform how the game is played.
Joining a modded server isn't as simple as connecting to a regular Minecraft server - you'll need to be running a matching modded client. This usually means using a custom launcher to ensure all the required mods are installed.