Part-number-only PDF for the 2N4402, 67.7 KB, catalogued as a schematic though it is most likely a component datasheet. The name carries no maker or revision detail. At the bench it helps identify leads, read absolute maximum ratings and compare electrical characteristics when checking a failed part with a meter or sourcing an equivalent. Before installing a replacement, make sure the package drawing and pin order in the document correspond to the real component.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.