A master plan is like a big roadmap that helps a city get ready for future changes and improvements. It can be for the whole city or just a specific area. The plan focuses on what the city will need in the future, like parks, roads, and buildings. It uses information about how the city is expected to grow and what people will need. The plan also looks at trends and predictions to make decisions about what should be built or improved. So basically, a master plan is a detailed guide for a city to make sure it develops in a smart and organized way.