'In Praise of Folly' is a satirical essay written by Desiderius Erasmus in 1509 that critiques the corrupt practices of society, especially within the church and among the educated elite. The work uses the character of Folly to humorously expose human vices, aiming to inspire reform and encourage a more pious and thoughtful approach to faith and learning, reflecting the broader themes of social and political change in 16th-century Europe.