A history is an array of data that is output at every time step. The type of history that you can include is dependent on the type of simulation (i.e. particle, electrostatic, electromagnetic, etc.) that you are running.
You can incorporate a history in text-setup through one of two ways:
Including a history by means of a History block
Calling a macro that automatically generates history blocks for you based on a few select input parameters
More details and some example usage of these two methods will be provided later on in Text Setup. For further information on history types and parameters as a whole, you can also visit the History section of the VSim Reference Manual.