Scientific models are representations of things, processes, or events that may be used to better comprehend the natural world. Models portray strange things using familiar items. Models may aid scientists in communicating their ideas, comprehending processes, and making predictions. Science requires a systematic approach, which includes using evidence from data collection, forming theories to explain this evidence, testing these theories, and creating new models when previous ones fail to provide the answers. Theoretical models are used to understand phenomena or aspects of reality that cannot be observed directly. These models help scientists make connections between different fields of knowledge and identify patterns within data. The goal is to develop new insights that lead to changes in behavior or technology. Practical models are used to communicate findings or discoveries and predict future events. They often include details not necessary for other purposes such as theory formation or development. Scientists use models to explore how things work. For example, a scientist might construct a model to study fluid dynamics, which is the study of fluids in motion. In this case, the model would consist of pipes, water, and magnets. The scientist could then test whether her hypothesis was correct by comparing it with what happened in the real world. If it proved accurate, it would guide them in designing new technologies for use in water treatment facilities.