According to investopedia, cyclical unemployment is the factor of overall unemployment that relates to the cyclical trends in growth and production that occur within the business cycle. This means that when business cycles are at their peak, cyclical unemployment will be low because total economic output has been maximized. It was further explained as one the five classes of unemployment as recognized by economists.
Economists describe it as the result of business not having enough demand for labour to employ all those who are looking for work. The lack of employer demand comes from a lack of spending and consumption in the overall economy.