Everyone of us is doing work on different objects every day. To work means to give energy to some object (or person) by exerting force and displacement.
An example of person doing work on object:
We can calculate work by using formula: 
Person is pushing the box
Person is pushing the boxW=FΔX
W=work
F=force
ΔX=displacement
F=force
ΔX=displacement
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