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Start with force; force does work when it acts on a body. This displaces the body from its original position. A force does work when it results in this body moving.

Unit wise, it is Joules [J] or Newton-Meters [Nm] or [N-m]. this would imply $W=F \cdot d$ where $d$ is the distance.

I prefer this definition; the work done by some force on an object travels along some curve S is given by a line integral $$W=\int_{S} \vec{F} \cdot d\vec{x}$$ when path dependent. When path independent, one obtains instead that $$W=U(d_{1})-U(d_{2})$$ where $U$ is called the potential energy, measured in joules. $d$ is a point at which the potential is evaluated; this can be time dependent.