There are about 50-60 formats that raster data may be stored in and used for various GIS operations. I understand that some are better suited for display, and some are only for certain types of data. That said some format types seem to be more prevalent than others. Which format are you using for your raster data?
NOTE: I picked out formats that let you interact with actual values, so PDF, JPG, KML, MBTiles and other display only ones are not listed. You can certainly pick other and note the usage in the comments... (Also, I could not seem to let the poll allow for multiple choices, sorry.)