Corruption involves wrongdoing by those in positions of authority through illegitimate, immoral, or unethical means, often involving bribery. It exists at multiple levels, from petty corruption like administrative bribery to grand corruption by high-level officials involving large sums. Causes include selfishness, lack of education, unequal systems, unemployment, and lack of religious principles. The most affected sectors are police, judiciary, power, tax, health, education, and land administration. Overcoming corruption requires individual accountability, public awareness, shaping minds through education, and action by media, religious leaders, and at the policy level.