Languages are a crucial part of world-building, helping to create depth and authenticity in your fictional world. Documenting languages can help maintain consistency and provide a rich cultural context for your story.

For example, if you're creating a fantasy world with multiple cultures, each with their own language, documenting the grammar, vocabulary, and writing systems can help make your world more immersive and believable.

Creating languages can also be a creative exercise that helps you think about how different cultures might express concepts differently, leading to unique world-building opportunities.

Languages in a story can also serve as plot devices, cultural markers, or tools for character development. By documenting languages and their relationships, you can use them more effectively in your narrative.