Work:

Work is done when a force acting on a body displaces it in the direction of a force. Work is a scalar quantity. It depends on the force acting on a body, displacement of the body, and the angle between them.

Work done = Force x displacement

Or   W = F S ......... (i)

$W = F_{x}\times S$
$W = \left(F\cos\theta\right)S$
$W = FS \cos\theta$ .......(ii)

Unit of work:

SI unit of work is the joule (J). it is defined as

The amount of work is one joule when a force of one newton displaces a body through one meter in the direction of the force.

Thus        $1 J = 1 N\times1m$