Model Builder in ArcGIS allows users to visually create, edit, and automate geospatial workflows. It provides an interface for dragging and connecting geoprocessing tools to perform a series of steps automatically. This reduces human errors and inefficiencies compared to manually running each step. Well-designed models improve reproducibility, simplify complex workflows, and inform less technical users how analyses are conducted. Key benefits include testing hypotheses with different data quickly, coding models into applications, and minimizing time spent on repetitive tasks.