File bl9382 in PDF format, 998 KB, catalogued as a schematic. The name gives only the part code with no device or brand, so its exact content should be checked after opening; codes of this form are typical of power management or LED driver chips, so this is most likely a datasheet. Such a document gives the pin layout, block diagram and recommended external components, which helps when testing an IC in circuit or choosing a replacement. Verify that the marking on the chip matches the code before using the pin data.
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 @gunvantrathore. 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.