Files formats

today i have been looking at the different types of file formats that i use on the macs

File formats:
.GIF
.PSD  PHOTOSHOP
.AI  ILLUSTRATOR
.TIFF
.IND   INDESIGN
.DOC  MICROSOFT WORD
.PNG
.XLS  MICROSOFT EXCEL
.JPG
.PDF
.RAW  PHOTOSHOP/LIGHTROOM
.PPT

 to the left are some of the documents on my mac, at the end of each document there is the type of file format they are saved as.