International marketing involves the buying and selling of goods and services across national borders. It entails larger scale operations than domestic marketing due to factors like intense global competition, the dominance of multinational corporations in world trade, and the need to consider cultural and economic differences between countries. There are both push factors that compel companies to expand internationally like market saturation at home as well as pull factors like opportunities for growth and lower costs abroad that attract companies to foreign markets. However, international marketing also presents challenges such as political and legal differences between countries, trade restrictions, and high costs associated with distance.