Blue-collar worker is an idiom referring to a member of the working class who performs manual labor and earns an hourly wage. Blue-collar workers are distinguished from Tertiary sector of industry service workers and from white-collar workers, whose jobs are not considered manual labor. However, some service workers are also often referred to as blue-collar workers. Traditionally, white-collar workers earn a monthly or annual salary rather than an hourly wage, although paying white-collar workers by the hour is an increasing practice, especially among independent tech contractors. Blue-collar work may be skilled or unskilled, and may involve manufacturing, mining, building and construction trades, law enforcement, mechanical work, maintenance, repair and operations maintenance or technical installations. The white-collar worker, by contrast, performs non-manual labor often in an office; and the service industry worker performs labor involving customer interaction, entertainment, retail and outside sales, and the like. Some service industry workers differ as they perform tasks that are mostly unskilled in the service sector. However, increasingly laid-off white collar workers suffering from corporate cutbacks and downsizing are looking toward jobs in the blue collar sector.