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Charge by conduction is a very common and simple method of imparting a charge on an object. When we refer to conduction, we are referring to objects that are going to be transferring their charge by coming in to physical contact with each other. Let us demonstrate this idea with a basic example:
Suppose we have one object that it negatively charged, meaning it has an excess of electrons. We also have another object, one that is neutral, meaning it has no deficiency or excess of electrons. When the object that is negatively charged comes into contact with the neutral object, the excess electrons from it will flow to the region of lesser electron density, which in this case is the neutral object. The charges will equalize, but since there was a larger number of electrons between the two objects than the neutral state, both objects will have some excess of electrons. Thus, we now have two negatively charged objects through the process of imparting a charge by conduction.