Why supply curve increase or decrease?

The supply curve can shift due to changes in production costs, technology, or the number of suppliers. An increase in production costs (e.g., higher wages or raw material prices) typically causes the supply curve to decrease (shift left), indicating a reduced quantity supplied at each price level. Conversely, improvements in technology or an increase in the number of suppliers can lead to a decrease in production costs, causing the supply curve to increase (shift right), indicating a greater quantity supplied at each price level.