PDF document of about 1.39 MB for the bq24780S, a Texas Instruments part, as the TI suffix in the name indicates. Although catalogued as a schematic, it is most likely the manufacturer datasheet with pinout, typical application circuit and register details. The bq24780S is a battery charge controller common on laptop motherboards, so the pin descriptions are useful when diagnosing no-charge, no-power or adapter-detection faults. Compare the package marking on the board with the document before probing pins.
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 @Boardviewno. 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.