Imports means goods coming into a country and export means goods going out of a country. The scale of imports and exports depends on currency of a country because higher currency lowers the level of export.
Generally imports are impacted by people's affordability of foreign goods. For example, rich countries like USA, Japan and China have large imports. Another reason to import goods is that a country does not produce or manufacture these goods. For example, India imports oil because it has very low oil production.
Exports depends on low prices. So developing countries have high level of export because their labor cost is low and as a result, they can offer goods at competitive prices. Sometimes some country dump their cheap goods into a country to help their manufacturers by subsidizing the goods. At other times, exports is used as a political weapon. For example, during 1972 oil embargo, Saudi Arabia wanted to exercise control over US political decisions.