Booleans (Mesh > Booleans) let you model with polygonal objects. A set of boolean operations let you combine input objects to make shapes that would otherwise be difficult to model using other techniques.
After performing a boolean operation, the original input objects can be selected and modified. You can use the Boolean stack to live edit your input objects and preview potential changes in your scene. Your changes are recalculated automatically, simplifying your operations in a procedural way.
When construction history is enabled, you can also select the input objects in the Channel Box, Hypergraph, Attribute Editor, or Outliner. Any changes you make to the original input objects are automatically applied to the new result object.