Primary activities and secondary activities are two important types of economic activities that revolve around obtaining and utilising resources necessary for survival. They differ significantly in their nature and purpose.

Primary activities are concerned with obtaining resources directly from natural sources. They involve extraction and collection of materials from farms, forests, mines, and the sea. These activities provide the raw materials that serve as inputs for other economic activities.

Secondary activities, on the other hand, add value to natural resources by transforming raw materials into valuable products. For example, cotton in the boll has limited use, but after it is transformed into yarn, it becomes more valuable and can be used for making clothes. Similarly, iron ore cannot be used directly from the mines, but after being converted into steel, it gets its value and can be used for making machines and tools.

Secondary activities are concerned with manufacturing, processing and construction (infrastructure) industries. Manufacturing essentially involves transforming raw materials into finished goods of higher value for sale in local or distant markets. While most secondary activities are carried on in factories, some like the entertainment industry and tourism industry are not factory-based.

Thus, while primary activities focus on extraction and collection from nature, secondary activities focus on transformation and value addition to resources.