Definitions of file types
Pixel dimentions: when the resolution of pixels are shown on a Tv, camera e.c.t
DPI resolution: Number of dots per inch on a digital print
Quality (of an image): This will introduce the amount of DPI, pixel dimentions, lenghth and witph of an image, the quality and characteristics.
Compression settings: digitaly controlling controlling vocals and audio
Bitmap: Bitmap are shown in many formats like, JPEG, GIF, PDF e.c.t they represent a number of dots and pixels in an image
Vector: represents magnitude and direction of an image
diffrences of Bitmap and vetor: Bitmap shows a more specific format of an image
JPEG: Joint photograthic expert group 
TIFF:Tagged image file format
PNG: Portable network graphics
BMP:Bitmap
GIF:Graphics interchange format
PDE: Portable document format
What are these different file types?: They are image formats
When is it mostly used?: They are often used to dislplay images on the internet
What might be a problem for these tpes of formats: Sometimes saving images with specific formats wont always work when you publishing it to anything. For example, if your publishing things on Deviantart or facebook, the image may need to be a JPEG.
What else have you found out that is useful?: GIF images are most common %54.7 of all the images are published from the web