Minecraft mod versions can vary widely in their features and functionalities based on the specific mod or modpack being used. Mods are created by the Minecraft community and can add many elements to the game, including new items, mechanics, creatures, dimensions, blocks, or even new gameplay experiences. Here are some common features that mods might introduce:

1. New Items and Blocks: Mods often add new tools, weapons, armor, building blocks, decorations, or resources unavailable in the vanilla game.

2. Gameplay Changes: Mods can alter existing gameplay mechanics or introduce new ones, such as magic systems, technology advancements, farming enhancements, or new crafting recipes.

3. New Biomes and Dimensions: Some mods create entirely new biomes or dimensions to explore, each with unique terrain, mobs, and resources.

4. Mobs and Creatures: Mods frequently introduce new creatures, animals, monsters, or NPCs to the game, each with its behavior and abilities.

5. Quests and Storylines: Some mods include questlines or story-driven elements that provide players with specific objectives and goals to achieve.

6. Visual and Audio Enhancements: Mods might enhance the game's graphics, textures, shaders, or audio effects, providing a different visual or auditory experience.

7. Multiplayer Support: Some mods focus on multiplayer features, such as new game modes or server-side enhancements.

8. Performance Optimization: Certain mods aim to improve the game's performance, reducing lag or optimizing resource usage.

9. Integration with Other Mods: Some mods are designed to work together, offering compatibility and additional features when used in conjunction with other specific mods or modpacks.

10. Customization and Configuration: Many mods allow players to customize settings, adjust configurations, or tailor the gameplay experience according to their preferences.

11. Automation and Machinery: Mods can introduce machinery, automation systems, or technological advancements allowing players to automate resource gathering, processing, and crafting.

12. Magic and Spells: Some mods focus on magic systems, introducing spells, magical items, rituals, or enchantments that offer unique abilities and powers.

13. New Game Modes: Mods might introduce new game modes or scenarios, such as survival challenges, hardcore modes, or creative-based gameplay variations.

14. Building and Construction: Certain mods provide players with additional building tools, architectural elements, or construction aids to create more complex and detailed structures.

15. Economy and Trading: Mods can add trading systems, currencies, or economies, allowing players to engage in commerce or create trading networks.

16. Role-Playing Elements: Some mods introduce role-playing aspects such as character classes, skill systems, or progression mechanics that encourage players to specialize in certain playstyles.

17. Custom Worlds and Terrain Generation: Mods might offer customized world generation options, allowing players to generate unique landscapes, structures, or terrains.

18. Transportation: Mods can include new vehicles, mounts, or transportation methods, offering faster travel options within the game.

19. Community and Social Features: Certain mods focus on enhancing multiplayer experiences by adding features like in-game chat systems, mini-games, or cooperative challenges.

20. Cross-Compatibility and Modpack Integration: Some mods aim to ensure compatibility with other mods or specific modpacks, allowing players to combine various mods seamlessly.

It's important to note that the Minecraft modding community is highly active and innovative. New mods and updates to existing mods continuously expand the range of features available, offering players an ever-evolving and diverse array of possibilities to customize their Minecraft experience.