Datasheet in PDF format, 456 KB, whose file name SDLS183 gives no hint of the exact component. The SDLS code series is used by Texas Instruments for logic family literature, so expect a standard logic device that the document cover will name. Such datasheets describe pin functions, operating voltage, input thresholds and output drive. They are handy when tracing a digital signal chain, checking whether an output is stuck, and confirming package and pin count before ordering a replacement part.
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.