JPEG-photographic image
GIF - Flash image
HTM - A website page ,and it refers to the code used to create the webpage.
Bitmap vs vector image

Vector images are images that are clearly when zoomed in on .
Bitmap are images that when zoomed in on are unclear

Wave and Mp4 -music files

gig -The gigabyte ( /ˈɡɪɡəbaɪt/ gig-ə-byt) is a multiple of the unit byte for digital information storage. The prefix giga means 10⁹ in the International System of Units (SI), therefore 1 gigabyte is 1000000000bytes. The unit symbol for the gigabyte is GB or Gbyte, but not Gb (lower case b) which is typically used for the gigabit.
terabyte -A terabyte is a multiple of the unit byte for digital information. The prefix tera means 10¹² in the International System of Units (SI), and therefore 1 terabyte is 1000000000000bytes, or 1 trillion (short scale) bytes, or 1000 gigabytes. 1 terabyte in binary prefixes is 0.9095 tebibytes, or 931.32 gibibytes. The unit symbol for the terabyte is TB or Tbyte.

zoom in and zoom - command + command -

deselects - command d

copy paste -command c / v

save -command s

psd - Photoshop document