Description: User modeling is the process of creating a representation of a user’s preferences and behaviors, which is fundamental for the development of customized natural language processing (NLP) applications. This approach allows systems to better understand the needs and desires of users, facilitating more effective and relevant interactions. In the context of NLP, user modeling involves collecting and analyzing data on how users interact with language, their communication patterns, and their linguistic preferences. This can include aspects such as tone, style, and vocabulary they prefer, as well as their thematic interests. By integrating this information into language models, more accurate and personalized responses can be generated, enhancing the user experience. Additionally, user modeling is essential in simulations with artificial intelligence, where the goal is to realistically replicate human behaviors. In summary, user modeling is a key tool for creating NLP applications that not only understand language but also adapt to the individual characteristics of each user, offering more natural and satisfying interactions.