A 444 KB PDF for the 2N7000 carrying the tag Sam, which probably identifies the manufacturer that issued it, although the name does not expand the abbreviation. Filed as a schematic, it is in practice a datasheet for the common small-signal N-channel MOSFET. Being larger than the other 2N7000 copies, it may contain extra graphs or package data. Use it to confirm leads, threshold voltage and limits, and compare with other vendor sheets where specifications differ.
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.