Is there a Library in Blender?

I do a lot of scenic and set design for theatre. is there a library in blender that I can save, say a drawing of a 2x4, to the library and then be able to add/import it when every I need it? Sorry if this is not in the correct place or already has been asked.

You can append or link data from a saved blend file into your currently open blend file https://www.blender.org/manual/data_system/linked_libraries.html