When a body moves from its initial position to its final position the work is done
When there is something physical change

We say that work is done when there is a displacement under applied force
When we apply force and their is displacement than we say work is done
Work is said to be done when the force acts on a body and displacement of the body caused by the applied force along the the direction of the applied force
Work is said to be done whenever a force acts on a body and there is a displacement of the body caused by the applied force along the direction of the applied force.

When we say work is done following points first the force act on an object second the object will displaced 1m long. So we say work is done
Work is said to be done if some force is applied and displacement is produced due to that force,if the angle between the direction of force applied and direction and direction of displacement produced is not right angle….
We say it when a force is applied on an object which gets displaced with the effect of force exerted.therefore W=F×D
Work is said to be done by a force acting on the object when the object is displaced along the direction of force. For example,(i) A girl pulls a trolley and the trolley moves through a distance. The girl has exerted a force on the trolley and it is displaced along the direction of force. Therefore, work is done.(ii) Lift a book through a height. To do this, you must apply a force. The book rises up. There is a force applied on the book and the book has moved up in the direction of force. Hence, work is done.Thus, following two conditions need to be satisfied for work to be done:(i) a force should act on an object, and(ii) the object must be displaced along the direction of force.