Character development is the backbone of compelling screenwriting. It involves crafting multi-dimensional personalities with distinct motivations, quirks, and flaws that drive the story forward. Well-developed characters engage audiences through authentic dialogue, complex relationships, and meaningful growth arcs. Effective techniques include creating detailed backstories, exploring archetypes and roles, and crafting unique voices for each character. Writers must balance revealing information gradually, avoiding stereotypes, and ensuring character actions remain consistent with their established traits and motivations throughout the narrative.