Planning and research in the mobile app development process in Coimbatore involves defining project goals, target audience analysis, and competitor assessment. It includes gathering requirements through stakeholder interviews and surveys. Market research plays a critical role in identifying user needs and preferences. In this phase, budgeting, resource allocation, and timeline estimation are established. Technology stack selection and platform decision (iOS, Android, or cross-platform) are also crucial. This foundational work ensures a clear roadmap for the development team, minimizing risks and enhancing project efficiency.