The document discusses different definitions and types of curriculum. It defines curriculum traditionally as subjects arranged in a certain sequence for instruction, but modernly as all planned learning experiences inside and outside the classroom. There are various types of curriculum including overt, hidden, null, and received. The document also discusses curriculum development as the process of deciding what to teach and learn while considering factors like tasks, roles, resources and ordering elements to create a curriculum plan. Good curriculum and development is characterized as continuously evolving, based on peoples' needs, and democratically conceived through long-term effort.