Work can be any activity requiring effort, while employment refers to work done in exchange for payment. Unemployment occurs when people seeking paid work cannot find suitable jobs. Reasons for unemployment include recessions, business closures, technological changes, and fewer jobs in agriculture. The government aims to reduce unemployment through benefits, retraining programs, and encouraging job creation and sharing. The labor force comprises those available for work, including the employed and unemployed but not retired, in education, or not wishing to work.