A Logisim library holds a set of tools that allow you to interact with a circuit via clicking and dragging the mouse in the canvas area. Most often, a tool is intended for adding components of a particular type into a circuit; but some of the most important tools, such as the Poke Tool () and the Select Tool (
),, allow you to interact with components in other ways.
All of the tools included in Logisim's built-in libraries are documented in this reference material.