PDF datasheet of 38.3 KB describing the SM3515 part. The name provides nothing beyond the part number, leaving the manufacturer and device function to be read from the sheet itself. Typical content includes pinout, electrical characteristics and package dimensions, which a repair technician uses to identify pins for probing, check ratings against the circuit and pick an equivalent. Any PDF reader handles it. Because the SM35xx numbers are close together, verify the exact marking on the component before using these values.
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 @datasheet_technar_org. 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.